What happens if a coinventor is omitted from a U.S. patent?

Patent's invalid unless corrected under §256 with notice and hearing for all omitted inventors.

Can you add coinventors after a patent issues?

Yes, but only if you notify and give hearing opportunity to the omitted person—unfindable? No dice.

Why did the Federal Circuit invalidate Fortress's patents?

Couldn't locate coinventor Huang for required §256(b) process; omission can't be fixed, so invalid under §101.

Federal Circuit Delivers Harsh Lesson: Skip a Coinventor, Lose Your Patent

Patent holders breathed easy thinking §256 could fix missing inventors post-issuance. Federal Circuit just slammed that door shut, invalidating two patents over one unfindable coinventor.

theAIcatchup Apr 08, 2026 4 min read

Federal Circuit seal overlayed on patent document with red strike through omitted inventor name

⚡ Key Takeaways

Federal Circuit rules §256 correction requires notifying omitted coinventors—no exceptions for the unfindable. 𝕏
Patents invalid if not all joint inventors listed; one suffices only for solo inventions. 𝕏
Outsourcing R&D? List foreign contributors upfront or risk portfolio wipeouts. 𝕏

Published by

theAIcatchup

Where law meets technology.

#35 USC 256 #Federal Circuit #Federal Circuit patent ruling #Section 256 #coinventor omission #patent invalidity

Worth sharing?

Get the best Legal Tech stories of the week in your inbox — no noise, no spam.

Originally reported by IPWatchdog

⚡ Key Takeaways

The 60-Second TL;DR

theAIcatchup

Share this article

Worth sharing?

Related Stories

Federal Circuit Drops the Hammer: Patents Die Without All Inventors Post-AIA

Missing Inventor? Your Patent Just Died, Says Federal Circuit

Prosecution Disclaimers That Refuse to Die

Federal Circuit to Centripetal: 'Allowing' a Packet Counts as Action – Patent Dies

Stay in the loop