1. 1. Authentication and notification

    Patents on proving that a person is who they say they are, and on getting a message to them.

    • Twilio v. TeleSign, Patent Trial and Appeal Board. U.S. Patent 7,945,034. Obviousness assertions against a fraud detection process based on a user's telephone number were rejected by the Board.
    • TeleSign v. Twilio, Central District of California. U.S. Patents 7,945,034; 8,462,920; 8,687,038; 9,300,792. Three inter partes reviews defended.
    • StrikeForce v. PhoneFactor and StrikeForce v. Microsoft, District of Delaware. U.S. Patents 7,870,599; 8,484,698; 8,713,701. Out of band authentication.
    • SimpleAir v. Microsoft, Eastern District of Texas. U.S. Patents 7,035,914; 6,021,433.

  2. 2. Cryptography, encoding and security

    Patents on keeping information unreadable to everyone except the intended reader.

    • Princeton Digital v. Microsoft, District of Delaware. U.S. Patent 4,813,056.
    • Tallgrass v. Microsoft, Eastern District of Texas. Addison Fischer Patents 5,346,972; 6,141,423; 6,216,229.
    • Pantaurus v. Microsoft, Eastern District of Texas. U.S. Patent 6,272,533.

  3. 3. Communications, email and imaging

    Patents on moving messages and pictures from one place to another.

    • Comcast v. Sprint, Eastern District of Pennsylvania. U.S. Patent 5,991,271.
    • InNova v. Cinemark, Eastern District of Texas. U.S. Patent 6,018,761.
    • E-contact v. Microsoft, Eastern District of Texas. U.S. Patent 5,347,579.
    • Skyline v. Microsoft, Eastern District of Virginia. U.S. Patent 7,551,172.

  4. 4. Chemical

    Patents in chemistry and materials, where the evidence is a laboratory result rather than a line of code.

    • Buckman v. Solenis, Western District of Tennessee. U.S. Patents 8,841,469; 8,962,059. Argued at the Federal Circuit.
    • Buckman v. Nalco, Northern District of Illinois. U.S. Patents 7,949,432; 8,012,758; 7,981,679.

  5. 5. Trademark

    Names and marks rather than inventions, in proceedings before the Trademark Trial and Appeal Board.

    • Defended a fashion company against a cancellation proceeding.
    • Pursued an opposition on behalf of a non-profit.

About this list

These are matters reported publicly by the firm. Every case is decided on its own facts, its own patents and its own record, and past results do not guarantee a similar outcome.