A Blog About Intellectual Property Litigation and the District of Delaware


Entries for tag: Written Description

Here is something you don't see everyday.

On Thursday, Judge Andrews granted a motion for summary judgment of invalidity for claims that failed to include a limitation from the spec.

In MHL Custom, Inc. v. Waydoo USA, Inc., C.A. No. 21-091-RGA (D. Del. Feb. 2, 2023), the patent at issue described a "passively stable hydrofoil." The hydrofoil is a board that a person can ride in the ocean, with a big fin under the water to keep it stable:

The hydrofoil at issue, from U.S. Pat. No. 9,586,659
The hydrofoil at issue, from U.S. Pat. No. 9,586,659 U.S. Pat. No. 9,586,659

As the Court describes, the whole patent is focused on the board's stability feature:

The specification of the '659 Patent only, and repeatedly, describes the …