Exhibit 99.1

1 September 2007 Credit Suisse:  Under Followed Opportunities ConferencePositioned to Capitalize on Growth in 3G Market

2This presentation contains forward-looking statements regarding InterDigital’s current beliefs, plans and expectations as to: (i) our strategy; (ii) our future growth potential in cash flow; (iii) our projected third quarter 2007 recurring revenues; (iv) future global mobile device sales and market opportunities; (v) growth in our 3G patent licensing program; (vi) our schedule for the delivery of engineering samples of our dual mode 2G/3G HSDPA/HSUPA modem ASIC; (vii) our ability to complete our ASIC as a commercial offering by the end of 2007; (viii) the competitive advantages of our ASIC and PC card reference platform; and, (ix) our ability to enter into IP agreements associated with our ASIC offering.Such statements are subject to risks and uncertainties.  Actual outcomes could differ materially from those expressed in or anticipated by such forward-looking statements due to a variety of factors including, but not limited to: (i) the market relevance of our technologies and changes in technology preferences of strategic partners or consumers; (ii) unanticipated technical or resource difficulties or delays related to further development of our technologies and products; (iii) our ability to leverage or enter into new customer agreements or strategic relationships; (iv) our ability to enter into additional patent license agreements; (v) changes in expenses related to our technology offerings and operations; (vi) potential difficulties in the production of ASIC samples; (vii) whether we have the appropriate financial assets and/or cash flows to support debt; (viii) unfavorable outcomes in patent disputes; (ix) changes in the market share and sales performance of our primary licensees, and any delay in receipt of quarterly royalty reports from our licensees; and, (x) changes or inaccuracies in market projections.

3Shaping the Future of Digital Wireless Technologies (Gp:) InventWirelessTechnologies(Gp:) Contribute toStandards(Gp:) LicensePatents(Gp:) Develop

WirelessProducts(Gp:) 30+ Year Digital Cellular Technology PioneerThousands of patents worldwideInventions used in every mobile device(Gp:) Key Contributor to Standards2G, 3G, and the future – 4G and beyondWireless LAN & Mobility/Convergence(Gp:) Provider of Complete 3G ModemsValidated solutions moving to siliconSynergy with patent licensing(Gp:) Highly Successful LicensorPatents have generated over $1 billion in cashLicensing leading manufacturers

4The Mobile Device Market OpportunityOver 1.3 Billion Mobile Devices Expected to Ship by 201270% to be 3GSixty Percent of 3G Mobile Devices Expected to be HSxPA by 2012Our Goal - Secure Cash Flow On Every 3G Mobile DeviceMillions of unitsSource: Strategy Analytics, July 2007

5Innovation Drives Patent Licensing SuccessBody: Strong Patent Portfolio  - 2G/3G Cellular and Emerging Technologies3,000+ Patents Issued in U.S and Worldwide and growingRanked 94 among companies worldwide with patents issued from USPTOMajor Accomplishments for 2006LG Electronics – $285 million – new 2G/3G licenseeNokia – $253 million – royalty dispute resolvedSamsung – $134 million arbitration awardStrong Results for First Half 2007Strong free cash flow *Apple license agreementRepurchase of $165 million of common stock Expanding recurring royalties  Very Solid and Growing Position in 3G Market30 - 40% of WCDMA and cdma2000® mobile devices licensed* InterDigital defines “free cash flow” as operating cash flow less purchases of property and equipment and investments in patents.

6Solid Recurring Revenue Base * Excludes revenues for past sales$ in Millions20062005 2007$55.5 - $56.5  Million

7Strong Free Cash Flow * Drives Shareholder Value Solid Balance Sheet$ in Millions$ in MillionsInvesting in Business &  Returning Value to ShareholdersAs of June 30* InterDigital defines “free cash flow” as operating cash flow less purchases of property and equipment and investments in patents.* As of June 30*

8Moving IP to Silicon Brings New Opportunities(Gp:) IP Blocks(Gp:) Full Modem Solution(Gp:) ASICs NXP (formerly Philips): 3G HSDPA ASIC designInfineon: WCDMA and HSDPA terminal unit protocol stackProvidesValidationBroadens Market OpportunityCan Drive Significant Value General Dynamics: 3G WCDMA modemInterDigital: 2G/3G Dual Mode baseband ASICS with HSDPA/HSUPA2005200620072008

9(Gp:) (Gp:) 2G 3G / Wireless BroadbandBasic Mobile PhonesFeature/Smart PhonesData-Centric DevicesProjected Annual Mobile Device Shipments (M units) Mobile Device Market OpportunityEmerging data-centric segment exceed 400M units in 2012Feature phones exceed 1B units and smart phones reach 250M units in 2012Plays to our strengths in high- performance modem technologySource: Strategy Analytics, July 2007

10Optimized solutions for distinct market segments High Performance ModemTechnology(Gp:) Baseband Designs(Gp:) Dual Mode Modem Technology (IP)(Gp:) Protocol SoftwareBasic Mobile PhonesFeature / Smart PhonesData-CentricDevicesEnabling semiconductor suppliers to compete in the feature / smart phone market with high-performance modem technologyEnabling data-centric specialty device manufacturers with high-performance baseband chip and reference designs(Gp:) Complete Dual Mode Baseband Chip(Gp:) Baseband Chip(Gp:) Reference PlatformsIP validatedin siliconSource: Strategy Analytics, July 2007

11Future Growth Potential in Cash Flow $800 $600  $400$200$1.00$1,200 $900  $600$300$1.50$1,600  $1,200  $800$400$2.00Annual Gross Margin Potential in 2011($ millions) 25%50% 75% 100%Essential patent position drives market penetration Product drives value per deviceToday we derive cash flow on 30 - 40% of 3G mobile devices soldGross Margin = Royalties + Chip Sales – COGS

12What to Look for in 2007Body: New license agreementsAdd new 3G licensees Build momentum for 2008 and beyondProduct development initiative goalsIP AgreementsEngineering samples by end of summerCommercial offering by end of yearLeveraging capitalFuture technology development for 4G and beyondProduct development around ASICsOpportunities to create additional shareholder value

13Appendix

14 Licensees as of September 2007