South Korea Patent

Yes — South Korea's utility model system (실용신안, sillyong sinan) provides 10-year protection for incremental improvements to the shape, structure, or combination of physical articles. Unlike invention patents, utility models do NOT protect: processes, methods, compositions of matter, biological inventions, or software (as the claims must be directed to structural features of articles). Key differences from invention patents: (1) Lower inventive step standard — the threshold for obtaining a utility model is easier to meet than for an invention patent; (2) Faster registration — typically 3–6 months vs 18–30 months for a patent; (3) Shorter term — 10 years (not 20 years) from the filing date; (4) Enforcement restriction — before filing a lawsuit or sending a cease-and-desist based on a registered utility model, the holder must obtain a Utility Model Technical Evaluation Report (기술평가서) from KIPO; if the evaluation is negative, the holder who continued asserting the utility model may be liable for damages. The technical evaluation functions as a pre-enforcement validity check. Who should use utility models: SMEs and individual inventors who have modest product improvements that need rapid, lower-cost protection but don't need 20-year patent protection. The 3–6 month registration timeline is dramatically faster than invention patents, making utility models valuable for products with short commercial lifecycles.

Foreign applicants filing patent applications with KIPO must appoint a registered Korean patent agent (변리사, byeonrisa) or a licensed Korean patent attorney firm to represent them — direct prosecution by foreign attorneys without Korean registration is not permitted. The filing pathway options: (1) Paris Convention: file directly with KIPO within 12 months of your earliest priority application (US provisional or non-provisional, EPO, PCT, etc.). Application must ultimately be in Korean — English filings are accepted but a Korean translation must be submitted within 14 months of the priority date. KIPO assigns a filing date on receipt; (2) PCT National Phase: enter Korean national phase within 31 months of earliest priority date. KIPO is a PCT receiving office and ISA/IPEA for PCT applications. National phase entry requires Korean translation and payment of KIPO national phase fees. Required documents: Korean translation of specification and claims; power of attorney (대리인 선임 신고); assignment (if applicant is not the inventor); priority document if claiming Paris Convention priority. Key deadlines to manage: (a) examination request within 3 years of filing — essential to calendar or the application goes abandoned; (b) Korean translation within 14 months if English-language PCT application. KIPO fees: approximately KRW 46,000 base filing fee + KRW 18,000 per claim over 10; examination request fee approximately KRW 143,000 + KRW 44,000 per claim over 10. Current exchange rate affects cost (approximately 1,350–1,400 KRW per USD in 2024). Typical Korean patent prosecution through grant: approximately $5,000–$12,000 USD in total (Korean agent fees + KIPO fees), depending on complexity and number of Office Actions.

In South Korea, patents are challenged through an invalidation trial (무효심판, muwyo simpan) filed with KIPO's Trial and Appeal Board (특허심판원, Intellectual Property Trial and Appeal Board, IPTAB). Key features: (1) Anyone can file — third parties, accused infringers, competitors, or even the public (unlike US IPR, which requires the petitioner to be a third party not at risk of bar from filing a civil action); (2) No time limit — an invalidation trial can be filed at any time during the patent's term, and even after expiration if the patent owner makes infringement claims related to the expired patent's term; (3) Any invalidity ground — novelty, inventive step, industrial applicability, enablement, written description, prior right (prior patent/trademark), subject matter eligibility, violations of the Korean Patent Act; (4) Preponderance of evidence standard — lower burden than US district court (clear and convincing evidence). Result: if IPTAB finds the patent invalid, it is invalidated with in rem effect — effective against all parties, not just the petitioner. Appeal path: IPTAB decision → Patent Court of Korea (특허법원, Daejeon) within 30 days → Supreme Court of Korea. The Patent Court has specialized technical judges who assist regular judges on technical questions — similar to the German Federal Patent Court model. Important: in Korean litigation, invalidity can also be raised as a defense in an infringement action in regular district courts (Supreme Court of Korea decision 2012Da42666 — Korean courts can assess invalidity as a defense in infringement proceedings, known as the 'Kilby defense' based on a Japanese precedent). The IPTAB/Patent Court path and the district court defense path are available in parallel.

South Korea's grace period (공지예외 주장, public disclosure exception) is 12 months — extended from 6 months to 12 months effective January 1, 2022 under an amendment to the Korean Patent Act § 30. This means: (1) Disclosures made by the inventor or applicant within 12 months before the Korean patent filing date do not constitute prior art against the application — as long as the applicant properly claims the grace period; (2) The grace period applies to the applicant's own disclosures (academic publications, presentations at conferences, demonstrations, public use, online disclosure) but does NOT cover third-party disclosures (if someone else independently discloses the invention, that disclosure IS prior art, even if within 12 months); (3) To claim the grace period, the applicant MUST: (a) submit a 공지예외 적용신청서 (Statement of Public Disclosure Exception) at the time of filing or within 30 days of filing; (b) submit supporting evidence of the disclosure (proof of publication, conference program, etc.) within 30 days of filing. Failure to timely claim the grace period and submit evidence results in loss of the grace period protection. Critical caution: the Korean grace period does NOT protect against prior art from other countries — an applicant's own public disclosure in the US before the 12-month window closes is still prior art under Korean law for third parties who file patents based on that disclosure. Strategy: for international filings, always file a PCT application or Paris Convention priority application before any public disclosure to avoid damaging prior art globally.

Yes — software and AI inventions are generally patentable in South Korea, and KIPO has historically been more permissive than the post-Alice USPTO on software patent eligibility. KIPO's Computer-Related Inventions Examination Guidelines (컴퓨터관련발명 심사기준, updated 2021): (1) Software inventions are patentable if they describe a specific configuration of hardware components AND the software creates a technical effect or produces a technical result — including information processing effects that interact with hardware; (2) Artificial intelligence (AI/ML) inventions: KIPO updated its AI examination guidelines in 2021 — claims directed to training methods, model architectures, data processing, and AI-based control systems are generally patentable when they produce a technical result or technical effect; (3) Business method inventions: more permissive than US — business methods implemented through specific software or hardware system configurations with technical character are generally accepted; the 'technical character' requirement is a functional limitation, not a blanket exclusion. Comparison to USPTO: while the USPTO's Alice/Mayo framework creates significant § 101 eligibility risk for software and AI claims, KIPO does not have an equivalent judicial doctrine with the same breadth. Applicants who face § 101 rejections at the USPTO often find that the same claims are allowable at KIPO with minimal amendments. Key consideration: KIPO requires clear disclosure of the technical structure and technical effects in the specification — claims that merely recite functional results without disclosing the specific technical implementation may face § 42 (written description/enablement) rejections. For AI/ML: disclose training data structure, model architecture details, and the specific technical problem being solved.