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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0000351012-05-000073.txt : 20050919
<SEC-HEADER>0000351012-05-000073.hdr.sgml : 20050919
<ACCEPTANCE-DATETIME>20050919161746
ACCESSION NUMBER:		0000351012-05-000073
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050915
FILED AS OF DATE:		20050919
DATE AS OF CHANGE:		20050919

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INTERMAGNETICS GENERAL CORP
		CENTRAL INDEX KEY:			0000351012
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS FABRICATED METAL PRODUCTS [3490]
		IRS NUMBER:				141537454
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0531

	BUSINESS ADDRESS:	
		STREET 1:		450 OLD NISKAYUNA RD
		STREET 2:		PO BOX 461
		CITY:			LATHAM
		STATE:			NY
		ZIP:			12110-0461
		BUSINESS PHONE:		5187821122

	MAIL ADDRESS:	
		STREET 1:		450 OLD NISKAYUNA ROAD
		STREET 2:		PO BOX 461
		CITY:			LATHAM
		STATE:			NY
		ZIP:			12110-0461

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			O BRIEN THOMAS J
		CENTRAL INDEX KEY:			0001199089

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-11344
		FILM NUMBER:		051091562

	BUSINESS ADDRESS:	
		STREET 1:		SENSIENT TECHNOLOGIES
		STREET 2:		777 E. WISCONSIN ST.
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53202
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c0001199089d20050919f4f.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-09-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000351012</issuerCik>
        <issuerName>INTERMAGNETICS GENERAL CORP</issuerName>
        <issuerTradingSymbol>IMGC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001199089</rptOwnerCik>
            <rptOwnerName>O BRIEN THOMAS J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>450 OLD NISKAYUNA ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>P. O. BOX 461</rptOwnerStreet2>
            <rptOwnerCity>LATHAM</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>12110-0461</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-09-15</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2774</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>29.73</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12196</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>/s/ Katherine M. Sheehan, Esq. on behalf of Thomas J. OBrien</signatureName>
        <signatureDate>2005-09-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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