A single “or” caused a patent translation dispute that reached China’s Supreme People’s Court
Can a single conjunction influence the fate of a patent?
In one of China’s most frequently cited patent invalidation cases involving a PCT application, the answer is yes.
During the Chinese national phase, the English word “or” was translated as the Chinese conjunction “或”. Years later, this seemingly ordinary choice became a central issue in proceedings that reached all the way to the Supreme People’s Court of China.
This case serves as a powerful reminder: patent translation is not mere language conversion. It is about accurately preserving the legal and technical meaning of claims. When that meaning shifts—even subtly—the consequences can be profound.
A Translation Issue That Reached the Supreme People's Court
The case concerned InterDigital’s invention patent “Retuning Gaps and Scheduling Gaps in Discontinuous Reception” (PCT Publication No. WO 2011/149920 A2; Chinese Patent No. ZL 201180025946.8, Publication No. CN 102907060 B), which entered China through the PCT national phase.
Huawei challenged the patent in invalidation proceedings before the China National Intellectual Property Administration (CNIPA). Although the patent was ultimately invalidated on grounds of lack of inventive step, the interpretation of the Chinese translation emerged as a recurring key issue—from CNIPA through the Beijing Intellectual Property Court to the Supreme People’s Court.
One Word, Two Different Meanings
The disputed phrasing appears straightforward at first glance:
English Claim:
“…no longer within DRX Active Time or within the required retuning gap period…”
Chinese Translation:
“…不再在DRX活动时间内或不再在需要的重调谐间隙周期内…”
The controversy centered on the logical relationship in a negative construction.
In the English original, read in light of the full claim and technical disclosure, it required the simultaneous absence of both conditions (neither A nor B).
The Chinese “或”, however, could naturally be read as requiring only one condition to be absent (not A or not B).
English logic: Neither A nor B — both conditions must be absent.
Chinese translation logic: Not A or not B — either condition is absent.
This difference effectively broadened the claim scope by lowering the threshold for satisfying the claimed condition.
The lesson is not to mechanically translate every “or” in negative sentences as “neither…nor…”. Rather, translators must carefully determine the intended logical relationship by considering the claims together with the specification and underlying technology.
Patent translation is ultimately an exercise in precise interpretation.
Why the Error Could Not Be Corrected
InterDigital later sought to amend the granted claims, arguing an “obvious translation error.”
CNIPA and the courts, including the Supreme People’s Court, rejected the request. They held that the granted claims contained no “obvious error” recognizable directly and unambiguously by a person skilled in the art from the patent documents as a whole.
Moreover, the proposed change would have altered the legal scope of protection, which is not permitted post-grant.
This highlights a practical reality in Chinese patent practice: while limited post-grant amendments are possible in some cases, substantive translation errors that affect claim scope are exceptionally difficult to remedy once the patent has been granted.
What This Case Means for PCT Applicants
The InterDigital case offers important practical lessons for applicants entering China via the PCT route:
· The translated claims become the legally operative text in China.
· Small linguistic choices, especially logical connectors, can significantly alter claim interpretation and scope.
· Once granted, translation errors impacting scope are often irreversible.
· High-quality patent translation requires integrated linguistic, technical, and legal expertise.
In essence, the real issue was whether the translation faithfully preserved the invention the applicant originally intended to protect.
Conclusion
Patents may be lost not only due to insufficient inventiveness but also because the language used no longer accurately conveys the intended legal and technical scope.
The InterDigital case demonstrates why translation should never be treated as a routine administrative task in PCT national phase entry. It is one of the final—and most critical—opportunities to safeguard the patent’s intended protection before risks become irreversible.
Have you encountered a patent translation issue where a seemingly minor linguistic choice had a significant impact on claim interpretation or scope?
