Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
KIERNAN BRIAN G
   2. Issuer Name and Ticker or Trading Symbol
InterDigital, Inc. [IDCC] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Executive VP, Standards
(Last)
(First)
(Middle)
781 THIRD AVENUE		 3. Date of Earliest Transaction (Month/Day/Year)
08/03/2009
(Street)

KING OF PRUSSIA, PA 19406		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 08/03/2009   M(1)   13,681 A $ 9.6 54,206 D  
Common Stock 08/03/2009   S(1)   13,681 D $ 30 40,525 D  
Common Stock 08/03/2009   M(1)   11,702 A $ 13.19 52,227 D  
Common Stock 08/03/2009   S(1)   11,702 D $ 30 40,525 D  
Common Stock 08/03/2009   M(1)   1,604 A $ 9.98 42,129 D  
Common Stock 08/03/2009   S(1)   1,604 D $ 30 40,525 D  
Common Stock 08/03/2009   M(1)   1,603 A $ 10.63 42,128 D  
Common Stock 08/03/2009   S(1)   1,603 D $ 30 40,525 D  
Common Stock               2,837 (2) I By 401(k) Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Options (Right-to-Buy) $ 9.6 08/03/2009   M(1)     13,681 12/31/2001(3) 12/20/2011 Common Stock 13,681 $ 0 0 D  
Options (Right-to-Buy) $ 13.19 08/03/2009   M(1)     11,702 06/30/2001(4) 01/29/2011 Common Stock 11,702 $ 0 0 D  
Options (Right-to-Buy) $ 9.98 08/03/2009   M(1)     1,604 12/27/2001(5) 12/27/2011 Common Stock 1,604 $ 0 0 D  
Options (Right-to-Buy) $ 10.63 08/03/2009   M(1)     1,603 12/18/2001(6) 12/18/2011 Common Stock 1,603 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
KIERNAN BRIAN G
781 THIRD AVENUE
KING OF PRUSSIA, PA 19406		       Executive VP, Standards  

Signatures

 Jannie K. Lau, Attorney-in-Fact for Brian G. Kiernan   08/05/2009
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
(2) As of the most recently published account statement, the reporting person beneficially owned this number of whole shares of Common Stock pursuant to the InterDigital Savings and Protection Plan.
(3) A grant of 13,681 options that vested as follows: 1,666 on 12/31/2001; 2,186 on 06/30/2002; 2,368 on 12/31/2002; 2,443 on 06/30/2003; 2,491 on 12/31/2003; and 2,527 on 06/30/2004.
(4) A grant of 11,702 options that vested as follows: 1,666 on 06/30/2001; 1,667 on 12/31/2001; 1,869 on 06/30/2002; 2,059 on 12/31/2002; 2,178 on 06/30/2003; and 2,263 on 12/31/2003.
(5) A grant of 1,604 options that vested as follows: 375 on 12/27/2001 and 1,229 on 12/22/2005.
(6) A grant of 1,603 options that vested as follows: 375 on 12/18/2001 and 1,228 on 12/22/2005.

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