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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1. Name and Address of Reporting Person * CAMPAGNA HARRY G   2. Issuer Name and Ticker or Trading Symbol InterDigital, Inc. [IDCC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 781 THIRD AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 09/19/2007 (Street) KING OF PRUSSIA,, PA 19406-1409 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 (1) 09/19/2007   M   45,000 A $ 5.4375 233,000 D   Common Stock (1) 09/19/2007   S   45,000 (2) D $ 22.0636 188,000 D   Common Stock (1) 09/20/2007   M   45,000 A $ 5.4375 233,000 (3) D

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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)

$ 5.4375

09/19/2007

M

45,000

(4)

09/22/2007

Common Stock

45,000

$ 0

45,000

D

Options (Right-to-Buy)

$ 5.4375

09/20/2007

M

45,000

(4)

09/22/2007

Common Stock

45,000

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
CAMPAGNA HARRY G 781 THIRD AVENUE KING OF PRUSSIA,, PA 19406-1409	X

Signatures

/s/ Rebecca Bridgeford Opher, Attorney-In-Fact for Harry G. Campagna		09/21/2007
**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)	InterDigital, Inc., a Pennsylvania corporation, is the successor company to the former Pennsylvania corporation named InterDigital Communications Corporation.
(2)	The sale of Common Stock reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 15, 2006.
(3)	On September 20, 2007, the Reporting Person exercised 45,000 options (set to expire on September 22, 2007) and held the underlying shares of Common Stock thereby increasing the Reporting Person's direct beneficial ownership to 233,000 shares.
(4)	A grant of 190,000 options awarded to the Reporting Person on 09/22/1997, and which vested as follows: 31,666 options on each of 12/31/1997 and 06/30/1998, and 31,667 options on each of 12/31/1998, 06/30/1999, 12/31/1999 and 06/30/2000.

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