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Divergent Patent Law Blog
Commentary on U.S patent prosecution, PTAB practice, Federal Circuit developments, and cross-border patent strategy.


From Rule 132 Declarations to Korean Experimental Evidence: A Two-Way Guide for U.S. and Korean Patent Prosecutors
Executive Summary: This article compares U.S. 37 C.F.R. § 1.132 declaration practice with the closest Korean analogue: a KIPO written argument supported by experimental results, comparative data, expert explanation, or other technical evidence. It explains that both systems use evidence to overcome examiner rejections when attorney argument alone is insufficient, especially in obviousness or inventive-step disputes involving unexpected or advantageous technical effects. But
Brandon Theiss
Aug 1326 min read


Who Is an Inventor—and of What?: Claims, Disclosure, and Inventorship in the United States, Europe, South Korea, China, and Japan
Executive Summary: This article examines how the meaning of “inventor” differs across the United States, Europe, South Korea, China, and Japan, focusing on whether inventorship is determined by the inventions claimed or by everything described in the application. It distinguishes the legally relevant object of the inquiry from the evidence used to identify its creators: claims may define the invention, while the specification, drawings, prior art, and development record revea
Brandon Theiss
Aug 1129 min read


From Festo to File History: Comparing U.S. Prosecution History Estoppel with EPO, Korean, Japanese, and Chinese Constraints on Claim Scope
Executive Summary: This article compares how prosecution history can limit patent claim scope in the United States, the EPO, Korea, Japan, and China. In the United States, prosecution history operates through several related doctrines: ordinary claim construction, prosecution disclaimer, amendment-based prosecution history estoppel under Festo, and argument-based estoppel where applicant remarks clearly surrender subject matter. The EPO stands apart because EPC proceedings ge
Brandon Theiss
Aug 922 min read


Bayh–Dole Across Borders: Government-funded inventions in the United States, EU/Horizon Europe, Germany, Japan, China, and South Korea—organized by coverage, allocation, and continuing
Executive Summary: Bayh–Dole is best understood not as an automatic university-ownership rule, but as a conditional government–contractor bargain that permits a contractor to retain title to qualifying federally funded inventions while preserving disclosure and patenting duties, utilization reporting, a paid-up government license, domestic-manufacturing safeguards, nonprofit-specific restrictions, and discretionary march-in authority tied to practical application. A comparati
Brandon Theiss
Aug 333 min read


From Korean “Technical Ideas” to U.S. “Practical Applications”: § 101 Strategy for Software and AI Patent Applications
Executive Summary: The article explains why Korean software and AI patent applications that appear eligible under Korean law may still face significant obstacles under U.S. patent-eligibility doctrine. Korean law focuses on whether the claimed invention is a “technical idea utilizing laws of nature” and, for software-related inventions, whether software-based information processing is concretely realized using hardware. U.S. law, by contrast, asks whether the claim falls with
Brandon Theiss
Jul 3020 min read
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