Federal Circuit Rules Omitted Coinventor Renders Patents Invalid When Correction Procedures Cannot Be Met
核心洞察
The Federal Circuit (搜索) affirmed that patents are invalid when a coinventor is omitted and cannot be added due to inability to provide required notice and hearing under Section 256(b).
In Fortress Iron LP (搜索) v. Digger Specialties Inc. (搜索), the court held that all inventors must be listed on patents with multiple inventors, rejecting arguments that partial inventor listing suffices.
The ruling establishes that omitted coinventors are "parties concerned" under patent law who must receive notice and opportunity for hearing before inventorship correction can occur.
The U.S. Court of Appeals for the Federal Circuit (搜索) issued a precedential ruling affirming that patents become invalid when a coinventor is omitted and cannot be added through proper legal procedures, establishing important precedent for patent inventorship requirements.
Case Background and Patent Dispute
In Fortress Iron LP (搜索) v. Digger Specialties Inc. (搜索), the Federal Circuit (搜索) addressed patents covering vertical cable rail barriers. Fortress Iron LP owned U.S. Patents 9,790,707 (搜索) and 10,883,290, both titled "Vertical Cable Rail Barrier." The inventions were conceived through collaboration between two Fortress employees and two employees from Fortress's quality control liaison, Quan Zhou Yoddex Building Material Co., Ltd (搜索) (YD).
The patents originally listed only the two Fortress employees as inventors, omitting the two YD employees, Hua-Ping Huang and Alfonso Lin. During patent infringement litigation initiated by Fortress against Digger in January 2021, Digger discovered that Huang and Lin had contributed to the invention.
Attempted Inventorship Correction
Fortress acknowledged that both Huang and Lin were coinventors and sought to add them under 35 U.S.C. § 256(a). While Lin was successfully added as a coinventor, Fortress could not locate Huang and therefore was unable to add him to the patents. The district court granted Digger's motion for summary judgment of invalidity due to incorrect inventorship and denied Fortress's motion for partial summary judgment to correct the patents by adding Huang.
Federal Circuit's Legal Analysis
The Federal Circuit (搜索), with Judge Lourie writing, addressed this case as one of first impression regarding the requirements for correcting patent inventorship. The court explained that Section 256(b) serves as a "savings provision" that prevents patents from being invalidated for omitting inventors, but only when specific statutory requirements are met.
The court held that an agreed-upon omitted coinventor such as Huang constitutes a "party concerned" under Section 256(b), requiring notice and opportunity for hearing prior to any correction of inventorship. As the court stated, "Inventors occupy the central role in the patent process. They are where it all begins, even if they eventually assign their interests to others, such as employers. Thus, their explicit references in the statutory framework cannot be taken lightly."
Rejection of Fortress's Arguments
Fortress argued that Huang should not be considered a "party concerned" because adding him as an inventor would benefit rather than adversely affect him. The Federal Circuit (搜索) rejected this interpretation, noting it would essentially rewrite the statute from "party concerned" to "those with an economic interest that may be adversely affected."
The court also dismissed Fortress's argument about constitutional standing, explaining that constitutional standing and "party concerned" status are "distinct issues with different requirements." Additionally, the court noted that neither the courts nor Fortress knows whether Huang would be adversely affected or benefit from being added as a coinventor.
Requirement for Complete Inventor Listing
The Federal Circuit (搜索) clarified that when an invention has multiple inventors, all must be listed on the patent. The court explained that Section 256(b) states that "the error of omitting inventors or naming persons who are not inventors shall not invalidate the patent in which such error occurred if it can be corrected." The necessary implication is that a patent becomes invalid for omitting inventors when that error cannot be corrected.
Rejecting Fortress's argument that only one true inventor needs to be named due to "permissive" language in Section 101, the court noted this interpretation would render Section 256(b) meaningless. "Section 101 and § 100(f), when read together with § 256(b), contemplate that when an invention has multiple inventors, they must all be listed on the patent," the court stated. "'Whoever' does not mean less than all."
Implications for Patent Practice
This precedential decision establishes that Section 256(b) functions as a savings provision only when its statutory requirements can be fully satisfied. The ruling emphasizes that procedural protections under the statute are prerequisites to relief, not mere formalities. Patent holders must ensure they can locate and provide proper notice to all coinventors when seeking to correct inventorship, as failure to do so can result in patent invalidity.
The decision also rejected arguments that the repeal of Section 102(f) following the America Invents Act supports the idea that joint inventors need not be named for patent validity, clarifying that Section 102(f) simply stated that non-inventors are not entitled to patents, not that actual inventors need not be named.