<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>0402 - Disclosure - Summary of Significant Accounting Policies (Policies)</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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   &lt;!-- Begin Block Tagged Accounting Policy: note2_accounting_policy_table1 - us-gaap:BasisOfAccountingPolicyPolicyTextBlock--&gt;
   &lt;p style="margin-top:6px;margin-bottom:0px"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&lt;b&gt;Basis of Presentation &lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
   &lt;p style="margin-top:6px;margin-bottom:0px"&gt;&lt;font style="font-family:times new roman" size="2"&gt;
   &lt;i&gt;Liquidation Basis of Accounting &lt;/i&gt;&lt;/font&gt;&lt;/p&gt;
   &lt;p style="margin-top:6px;margin-bottom:0px; text-indent:4%"&gt;&lt;font style="font-family:times new roman" size="2"&gt;With the authorization of the Plan of
   Dissolution, the Company adopted the liquidation basis of accounting effective as of the close of business on September&amp;#160;30, 2010. The liquidation basis of accounting will continue to be used by the Company until such time that the plan is
   terminated and all net assets have been distributed to shareholders. &lt;/font&gt;&lt;/p&gt;
   &lt;p style="margin-top:12px;margin-bottom:0px; text-indent:4%"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Under the liquidation basis of accounting, the carrying
   amounts of assets as of the close of business on September&amp;#160;30, 2010, the date of the authorization of the Plan of Dissolution by the Company, were adjusted to their estimated net realizable values and liabilities, including the estimated costs
   associated with implementing the Plan of Dissolution, were stated at their estimated settlement amounts. Such value estimates were updated by the Company as of June&amp;#160;30, 2013 and December&amp;#160;31, 2012. &lt;/font&gt;&lt;/p&gt;
   &lt;p style="margin-top:12px;margin-bottom:0px; text-indent:4%"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Consolidated Statements of Net Assets (Liquidation Basis) and Changes in Net Assets (Liquidation Basis) are the financial statements
   presented under the liquidation basis of accounting. The valuations of assets at their net realizable values and liabilities at their anticipated settlement amounts represent estimates, based on present facts and circumstances associated with
   carrying out the Plan of Dissolution based on the assumptions set forth below. The actual values and costs associated with carrying out the Plan of Dissolution are expected to differ from the amounts shown herein because of the inherent uncertainty
   of the estimates. Such differences may be material. In particular, the estimates of the Company&amp;#8217;s liquidation costs will vary with the length of time it operates under the Plan of Dissolution. Accordingly, it is not possible to predict the
   aggregate amount or timing of future distributions to stockholders, as long as the Plan of Dissolution is in effect and no assurance can be given that the amount of liquidating distributions to be received will equal or exceed the estimate of net
   assets in liquidation presented in the accompanying Consolidated Statements of Net Assets (Liquidation Basis). &lt;/font&gt;&lt;/p&gt;
   &lt;p style="font-size:1px;margin-top:12px;margin-bottom:0px"&gt;&amp;#160;&lt;/p&gt;
   &lt;p style="margin-top:0px;margin-bottom:0px; text-indent:4%"&gt;&lt;font style="font-family:times new roman" size="2"&gt;The estimated net costs to be incurred during liquidation
   as of June&amp;#160;30, 2013 are as follows: &lt;/font&gt;&lt;/p&gt;
   &lt;p style="font-size:12px;margin-top:0px;margin-bottom:0px"&gt;&amp;#160;&lt;/p&gt;
   &lt;table cellspacing="0" cellpadding="0" width="68%" border="0" style="border-collapse:collapse; text-align: left" align="center"&gt;
   &lt;!-- Begin Table Head --&gt;
   &lt;tr&gt;
   &lt;td width="90%"&gt;&amp;#160;&lt;/td&gt;
   &lt;td valign="bottom" width="7%"&gt;&amp;#160;&lt;/td&gt;
   &lt;td&gt;&amp;#160;&lt;/td&gt;
   &lt;td&gt;&amp;#160;&lt;/td&gt;
   &lt;td&gt;&amp;#160;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;!-- End Table Head --&gt;
   &lt;!-- Begin Table Body --&gt;
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   &lt;td valign="top"&gt;
   &lt;p style="margin-left:1.00em; text-indent:-1.00em"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Compensation for employees and directors&lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom" align="right"&gt;&lt;font style="font-family:times new roman" size="2"&gt;131&lt;/font&gt;&lt;/td&gt;
   &lt;td nowrap="nowrap" valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
   &lt;td valign="top"&gt;
   &lt;p style="margin-left:1.00em; text-indent:-1.00em"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Compliance costs&lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom" align="right"&gt;&lt;font style="font-family:times new roman" size="2"&gt;94&lt;/font&gt;&lt;/td&gt;
   &lt;td nowrap="nowrap" valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;/tr&gt;
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   &lt;td valign="top"&gt;
   &lt;p style="margin-left:1.00em; text-indent:-1.00em"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Insurance fees&lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom" align="right"&gt;&lt;font style="font-family:times new roman" size="2"&gt;210&lt;/font&gt;&lt;/td&gt;
   &lt;td nowrap="nowrap" valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
   &lt;td valign="top"&gt;
   &lt;p style="margin-left:1.00em; text-indent:-1.00em"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Professional fees&lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom" align="right"&gt;&lt;font style="font-family:times new roman" size="2"&gt;650&lt;/font&gt;&lt;/td&gt;
   &lt;td nowrap="nowrap" valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr bgcolor="#cceeff"&gt;
   &lt;td valign="top"&gt;
   &lt;p style="margin-left:1.00em; text-indent:-1.00em"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Income taxes&lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom" align="right"&gt;&lt;font style="font-family:times new roman" size="2"&gt;(132&lt;/font&gt;&lt;/td&gt;
   &lt;td nowrap="nowrap" valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;)&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr style="font-size:1px"&gt;
   &lt;td valign="bottom"&gt;&amp;#160;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&amp;#160;&lt;/td&gt;
   &lt;td valign="bottom"&gt;
   &lt;p style="border-top:1px solid #000000"&gt;&amp;#160;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;
   &lt;p style="border-top:1px solid #000000"&gt;&amp;#160;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td&gt;&amp;#160;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
   &lt;td valign="top"&gt;
   &lt;p style="margin-left:3.00em; text-indent:-1.00em"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Subtotal&lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom" align="right"&gt;&lt;font style="font-family:times new roman" size="2"&gt;953&lt;/font&gt;&lt;/td&gt;
   &lt;td nowrap="nowrap" valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr bgcolor="#cceeff"&gt;
   &lt;td valign="top"&gt;
   &lt;p style="margin-left:1.00em; text-indent:-1.00em"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Less: interest income on cash and investment balances&lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom" align="right"&gt;&lt;font style="font-family:times new roman" size="2"&gt;(45&lt;/font&gt;&lt;/td&gt;
   &lt;td nowrap="nowrap" valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;)&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr style="font-size:1px"&gt;
   &lt;td valign="bottom"&gt;&amp;#160;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&amp;#160;&lt;/td&gt;
   &lt;td valign="bottom"&gt;
   &lt;p style="border-top:1px solid #000000"&gt;&amp;#160;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;
   &lt;p style="border-top:1px solid #000000"&gt;&amp;#160;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td&gt;&amp;#160;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
   &lt;td valign="top"&gt;
   &lt;p style="margin-left:3.00em; text-indent:-1.00em"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Net costs to be incurred during liquidation&lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
   &lt;td valign="bottom" align="right"&gt;&lt;font style="font-family:times new roman" size="2"&gt;908&lt;/font&gt;&lt;/td&gt;
   &lt;td nowrap="nowrap" valign="bottom"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr style="font-size:1px"&gt;
   &lt;td valign="bottom"&gt;&amp;#160;&lt;/td&gt;
   &lt;td valign="bottom"&gt;&amp;#160;&lt;/td&gt;
   &lt;td valign="bottom"&gt;
   &lt;p style="border-top:3px double #000000"&gt;&amp;#160;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td valign="bottom"&gt;
   &lt;p style="border-top:3px double #000000"&gt;&amp;#160;&lt;/p&gt;
   &lt;/td&gt;
   &lt;td&gt;&amp;#160;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;!-- End Table Body --&gt;
   &lt;/table&gt;
   &lt;p style="margin-top:12px;margin-bottom:0px; text-indent:4%"&gt;&lt;font style="font-family:times new roman" size="2"&gt;These estimates are based on assumptions regarding the Company&amp;#8217;s ability to settle outstanding obligations to
   creditors and the ultimate timing of distributions to its stockholders, but does not include any settlement amounts, fines or penalties, if any, that the Company might incur as a result of any legal proceedings. These estimates are reviewed
   quarterly and adjusted as projections and assumptions change. &lt;/font&gt;&lt;/p&gt;
</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).</ElementDefenition><ElementReferences>No definition available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Liquidation Basis of Accounting</Label></Row><Row FlagID="0"><Id>3</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>us-gaap_ConsolidationPolicyTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>verboseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="Jan_01_2013_Jun_30_2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --&gt;
   &lt;!-- Begin Block Tagged Accounting Policy: note2_accounting_policy_table2 - us-gaap:ConsolidationPolicyTextBlock--&gt;
   &lt;p style="margin-top:18px;margin-bottom:0px"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&lt;i&gt;Principles of Consolidation &lt;/i&gt;&lt;/font&gt;&lt;/p&gt;
   &lt;p style="margin-top:6px;margin-bottom:0px; text-indent:4%"&gt;&lt;font style="font-family:times new roman" size="2"&gt;
   As of June&amp;#160;30, 2013, the consolidated financial statements of the Company include the accounts of Allied and its wholly-owned subsidiaries, which are as follows: &lt;/font&gt;&lt;/p&gt;
   &lt;p style="font-size:6px;margin-top:0px;margin-bottom:0px"&gt;&amp;#160;&lt;/p&gt;
   &lt;table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"&gt;
   &lt;tr&gt;
   &lt;td width="5%"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td width="2%" valign="top" align="left"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#8226;&lt;/font&gt;&lt;/td&gt;
   &lt;td width="1%" valign="top"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td align="left" valign="top"&gt;
   &lt;p align="left"&gt;&lt;font style="font-family:times new roman" size="2"&gt;ARC Europe, a Belgian company, &lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;/table&gt;
   &lt;p style="font-size:6px;margin-top:0px;margin-bottom:0px"&gt;&amp;#160;&lt;/p&gt;
   &lt;table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"&gt;
   &lt;tr&gt;
   &lt;td width="5%"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td width="2%" valign="top" align="left"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#8226;&lt;/font&gt;&lt;/td&gt;
   &lt;td width="1%" valign="top"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td align="left" valign="top"&gt;
   &lt;p align="left"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Allied Research BV (&amp;#8220;BV&amp;#8221;), a Dutch company, &lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;/table&gt;
   &lt;p style="font-size:6px;margin-top:0px;margin-bottom:0px"&gt;&amp;#160;&lt;/p&gt;
   &lt;table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"&gt;
   &lt;tr&gt;
   &lt;td width="5%"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td width="2%" valign="top" align="left"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#8226;&lt;/font&gt;&lt;/td&gt;
   &lt;td width="1%" valign="top"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td align="left" valign="top"&gt;
   &lt;p align="left"&gt;&lt;font style="font-family:times new roman" size="2"&gt;Allied Research Cooperative (&amp;#8220;Coop&amp;#8221;) and, &lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;/table&gt;
   &lt;p style="font-size:6px;margin-top:0px;margin-bottom:0px"&gt;&amp;#160;&lt;/p&gt;
   &lt;table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"&gt;
   &lt;tr&gt;
   &lt;td width="5%"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td width="2%" valign="top" align="left"&gt;&lt;font style="font-family:times new roman" size="2"&gt;&amp;#8226;&lt;/font&gt;&lt;/td&gt;
   &lt;td width="1%" valign="top"&gt;&lt;font size="1"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
   &lt;td align="left" valign="top"&gt;
   &lt;p align="left"&gt;&lt;font style="font-family:times new roman" size="2"&gt;ADG Sub USA, Inc. (&amp;#8220;Mecar USA&amp;#8221;) &lt;/font&gt;&lt;/p&gt;
   &lt;/td&gt;
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