Centripetal Networks Patent Claim Held Unpatentable——Federal Circuit Affirms PTAB Anticipation Finding

On April 2, 2026, the U.S. Court of Appeals for the Federal Circuit affirmed a Patent Trial and Appeal Board (PTAB) final written decision in Centripetal Networks LLC v. Keysight Technologies Inc., concluding that the Board correctly construed a limitation of an independent patent claim and properly found that prior art anticipated the claim. The decision reinforces the significance of claim construction and prior art analysis at the post-grant review stage.

In this precedential ruling, the Federal Circuit examined the PTAB’s interpretation of a technical limitation within one of Centripetal’s independent claims. The court determined that the Board’s construction was legally sound and that the prior art reference cited——identified as Keysight’s prior disclosures or prior patent art——satisfied every element of the independent claim at issue.

The concept of “anticipation” under 35 U.S.C. Section 102 is distinct from the obviousness doctrine codified in Section 103. A patent claim is anticipated when a single prior art reference explicitly discloses each and every element of the claimed invention. This is a more exacting standard than obviousness, which involves combining multiple references. Once anticipation is established, no amount of non-obvious subject matter can save the claim; it is simply not novel.

The practical significance of this decision extends to all patent owners facing post-grant proceedings before the PTAB. Proper claim construction during proceedings is critical, as the interpretation adopted by the Board directly determines whether prior art references can be mapped onto the claimed elements. Patent owners must present clear evidence distinguishing their claimed limitations from the prior art or risk affirmation of adverse PTAB decisions on appeal to the Federal Circuit.

In technology fields with dense prior art bodies——such as networking and communications——patent claims must be carefully drafted and defended to ensure that their technical scope is not entirely subsumed within existing disclosures. The Centripetal decision exemplifies the rigorous scrutiny applied to patent validity in these sectors and underscores the importance of robust claim prosecution strategies.