Prior Art Analysis

The America Invents Act (AIA) fundamentally changed prior art rules for patent applications with effective filing dates on or after March 16, 2013: THE AIA FIRST-INVENTOR-TO-FILE SYSTEM: the US transitioned from a first-to-invent system (pre-AIA) to a first-inventor-to-file system (AIA); under AIA, the prior art analysis focuses on what was publicly available BEFORE the effective filing date of the claimed invention; AIA § 102(a)(1) — PRIOR ART FROM THE WORLD: a claimed invention is NOT patentable if it was PATENTED; DESCRIBED IN A PRINTED PUBLICATION; IN PUBLIC USE; ON SALE; OR OTHERWISE AVAILABLE TO THE PUBLIC anywhere in the world before the effective filing date of the claimed invention; KEY ASPECTS OF § 102(a)(1): 'effective filing date' = the actual US filing date OR the date of the earliest application in the priority chain if priority is properly claimed; 'printed publication' = anything publicly accessible — NOT just printed on paper; archived websites, uploaded papers, conference posters, grad student theses, and social media posts can all be printed publications if they were publicly accessible; 'public use' = use that does not maintain secrecy of the invention; 'on sale' = offering to sell an embodiment of the invention; 'otherwise available to the public' = catch-all for anything not covered by the specific categories; AIA § 102(a)(2) — PATENT DOCUMENTS WITH EARLIER FILING DATES: a claimed invention is not patentable if it was DESCRIBED IN A US PATENT, US PATENT APPLICATION, or PCT APPLICATION DESIGNATING THE US that: was effectively filed BEFORE the effective filing date of the claimed invention; AND was later published or granted; CRITICAL DISTINCTION FROM § 102(a)(1): a patent application filed before your filing date is prior art under § 102(a)(2) even if it was NOT PUBLIC before your filing date; the prior art date for § 102(a)(2) is the FILING DATE, not the publication date; AIA § 102(b) GRACE PERIOD EXCEPTIONS: § 102(b)(1) provides exceptions to § 102(a)(1) prior art: disclosures made within 1 year before the effective filing date ARE EXCLUDED from prior art if the disclosure was: made BY the inventor or joint inventor; OR made by a third party who obtained the subject matter from the inventor (directly or indirectly); OR made by a third party AFTER the inventor made a prior public disclosure; § 102(b)(2) provides limited exceptions to § 102(a)(2) prior art for disclosures from common ownership or joint research agreements; PRE-AIA APPLICATIONS: applications with effective filing dates before March 16, 2013 are STILL governed by pre-AIA § 102; the pre-AIA system is significantly different (e.g., date of invention, not filing date, matters; different prior art categories; 12-month on-sale bar).

Anticipation and obviousness are distinct rejections that use prior art in fundamentally different ways: ANTICIPATION (§ 102) — ONE REFERENCE, ALL ELEMENTS: a claim is anticipated if a SINGLE PRIOR ART REFERENCE discloses EVERY LIMITATION of the claim; the anticipating reference must disclose each and every element of the claim, either expressly or inherently; INHERENT ANTICIPATION: a prior art reference inherently anticipates a claim element if the element is a NECESSARY result of the prior art disclosure, even if not explicitly mentioned; example: if a prior art process for making compound A necessarily produces compound B as a byproduct (even if compound B is not mentioned), the prior art reference inherently discloses compound B; EXPLICIT vs. INHERENT DISCLOSURE: express disclosure = the reference literally says the limitation; inherent disclosure = the limitation necessarily results from what the reference describes; ANTICIPATION REQUIRES SAME INVENTION: the prior art must disclose the SAME invention — not something similar; anticipation is all-or-nothing; OBVIOUSNESS (§ 103) — COMBINING REFERENCES: a claim is obvious if the claimed invention would have been obvious to a POSITA at the time of invention based on the prior art; obviousness does NOT require a single reference that discloses everything; examiners and challengers can COMBINE multiple prior art references to make out a § 103 rejection; THE KSR FRAMEWORK (KSR International v. Teleflex, S.Ct. 2007): the Supreme Court established a flexible obviousness standard; a motivation to combine references can come from: explicit suggestion in the references to combine; obvious to try (finite identifiable predictable solutions); ordinary skill in the art (combining known techniques for known reasons); solving a recognized problem with a known solution; what is obvious can be determined by common sense; TEACHING AWAY: a prior art reference TEACHES AWAY from a combination if it: actively discourages the modification; warns that the modification would not work; suggests the modification is impossible; teaching away is a SECONDARY CONSIDERATION that weighs against obviousness but does not automatically defeat an obviousness rejection; SECONDARY CONSIDERATIONS (OBJECTIVE INDICIA OF NON-OBVIOUSNESS): even if the primary analysis suggests obviousness, the following can rebut: commercial success of the claimed invention; long felt need that others tried but failed to solve; unexpected results (the claimed invention achieves results that POSITA would not have expected); copying by others; industry praise; these must have a NEXUS to the claims; secondary considerations can overcome a prima facie case of obviousness but the more powerful the prima facie case, the stronger the secondary considerations must be; CLAIM CHARTS FOR PRIOR ART ANALYSIS: construct a claim chart with each claim limitation in the left column; for anticipation: the right column shows where each limitation appears in a single reference; for obviousness: use separate columns for each reference and identify which limitations come from which reference; gaps in the claim chart (limitations with no prior art support) are potential patentable distinctions.

Effective prior art searching requires combining multiple search strategies and databases to achieve comprehensive coverage: WHY PRIOR ART SEARCHING IS CRITICAL: a thorough prior art search BEFORE filing identifies: (1) whether the invention is truly novel and non-obvious; (2) what claim scope is achievable; (3) potential obstacles in prosecution; (4) what competitors have already patented; SEARCH STRATEGY OVERVIEW: a professional prior art search should include: (1) keyword searches in patent databases; (2) classification-based searches (CPC codes); (3) inventor name searches; (4) assignee searches for key competitors; (5) non-patent literature (NPL) searches; PATENT DATABASES: USPTO PATENT CENTER / PATENT FULL-TEXT AND IMAGE DATABASE (PatFT and AppFT): full text of all US patents (since 1976) and published applications; classification searching; Google Patents: perhaps the most accessible and comprehensive patent search tool; full text search; international coverage; prior art date filtering; cited/citing reference chains; Derwent Innovation (Clarivate): professional patent search database; enhanced abstracts; family information; citation analysis; Espacenet (EPO): European Patent Office search database; free access; strong for European patents; IPC/CPC classification searching; WIPO PatentScope: PCT applications; international patent family data; supports 10 languages; CLASSIFICATION SEARCH — THE PROFESSIONAL APPROACH: Cooperative Patent Classification (CPC) codes are hierarchical classification codes used by the USPTO and EPO; searching by CPC code finds ALL patents in the same technology space regardless of what keywords they use; classification codes for your technology area can be found using the USPTO Classification Schedule; a skilled searcher combines keyword searches WITH classification searches; NON-PATENT LITERATURE (NPL): for some technologies, the most relevant prior art is NOT in patents — it is in academic papers, conference proceedings, textbooks, or technical manuals; for biotechnology: PubMed, NCBI, GenBank (gene sequences); for electronics/engineering: IEEE Xplore, ACM Digital Library; for chemistry: SciFinder, Reaxys, STN; for general scientific literature: Google Scholar, Web of Science; SPECIFIC SEARCH TECHNIQUES: citation mining: find a highly relevant patent, then look at all patents it cites AND all patents that cite it; this traces the technology development forward and backward in time; inventor searches: if you identify the leading researcher in a field, search all patents by that inventor; classification-plus-assignee: narrow a broad classification by adding a key competitor's name as assignee; date-limited searches: search for prior art only within the relevant prior art date window; WHAT TO DOCUMENT: for each reference found, document: the date it became prior art (filing date for patents; publication date for NPL); the specific claims or pages that disclose each element; why the reference is or is not relevant; FREEDOM-TO-OPERATE SEARCHES vs. PATENTABILITY SEARCHES: a PATENTABILITY search looks for prior art that would anticipate or render obvious the claims you want to file; a FREEDOM-TO-OPERATE search looks for patents whose claims might be infringed by making or selling your product; these are different searches with different scope; never conflate the two.

Claim charts are the primary analytical tool for mapping prior art to patent claims in both prosecution and litigation: PURPOSE OF CLAIM CHARTS: to systematically compare each limitation of a patent claim to a prior art reference (or accused product); to identify which limitations ARE and ARE NOT disclosed; claim charts make the analysis transparent, reproducible, and documentable; BASIC STRUCTURE OF A CLAIM CHART: a standard claim chart is a table with the following columns: Left column: the claim being analyzed, broken out limitation-by-limitation; Middle column(s): the prior art reference (one column per reference for obviousness combinations); Right column: identification of the specific passage, figure, or inherent disclosure in the reference that maps to the claim limitation; ANALYZING CLAIM 1 LIMITATION BY LIMITATION: take a patent claim and PARSE it into individual limitations; example for claim 1 ('A widget comprising: a housing having an inner diameter of 5-10 mm; a motor disposed within the housing; a controller connected to the motor and configured to regulate motor speed;'): Limitation 1: A widget; Limitation 2: a housing having an inner diameter of 5-10 mm; Limitation 3: a motor disposed within the housing; Limitation 4: a controller connected to the motor; Limitation 5: a controller configured to regulate motor speed; for each limitation, identify whether the prior art reference discloses it — if YES, where (column 2); if NO, note the gap; GAPS = PATENTABLE DISTINCTIONS: any limitation that CANNOT be found in the prior art (not disclosed expressly or inherently, and not suggested by a combination of references) is a POTENTIAL PATENTABLE DISTINCTION; the claim needs to be drafted to INCLUDE that limitation (or that limitation needs to survive prosecution); CLAIM CHART FOR OBVIOUSNESS (MULTIPLE REFERENCES): for an obviousness combination, use one column per reference; identify which limitations come from Reference A and which come from Reference B; also need to establish a MOTIVATION TO COMBINE (why would POSITA combine these references?); CLAIM CHARTS IN IPR/PGR PETITIONS: the USPTO requires IPR and PGR petitions to map every limitation of every challenged claim to specific portions of the cited prior art; the petition must explain WHY each limitation is or is not disclosed by each reference; a well-constructed claim chart makes the petition much more persuasive; CLAIM CHARTS IN PATENT PROSECUTION RESPONSES: when responding to a prior art rejection, the practitioner should: identify which limitations the examiner has mapped to which references; challenge any limitation that is not properly disclosed in the cited reference; show on a claim chart where the examiner's mapping breaks down; CLAIM CHARTS IN LICENSING NEGOTIATIONS: claim charts mapping a patent to a licensee's product can be used in licensing discussions to show that the licensee practices specific patent claims; this is a key tool in patent assertion; REVERSE CLAIM CHARTS: sometimes used in FTO analysis to show that a patent's claims do NOT read on your product; the reverse chart maps each limitation of the threatening patent to your product and identifies where the correspondence fails.

Prior art analysis differs significantly between USPTO examination and IPR/PGR proceedings in terms of which prior art can be used, standards of proof, and who controls the analysis: USPTO EXAMINATION — PRIOR ART RULES: during prosecution, the examiner uses ALL categories of prior art under § 102 and § 103; prior art includes: patents; published applications; printed publications; prior public use (§ 102(a)(1)); prior commercial offers for sale (§ 102(a)(1)); any other publicly available disclosure (§ 102(a)(1)); the examiner applies a PREPONDERANCE OF THE EVIDENCE standard in rejecting claims; USPTO uses BROADEST REASONABLE INTERPRETATION (BRI) of claim terms during examination; APPLICANT'S TOOLS TO OVERCOME PRIOR ART: arguments that the prior art does not disclose a limitation; claim amendments to add limitations not disclosed in the prior art; § 1.131 declarations (swearing behind prior art under pre-AIA); § 1.132 declarations (unexpected results; long-felt need; other secondary considerations); IPR PROCEEDINGS — PRIOR ART RULES (INTER PARTES REVIEW): IPR petitions can ONLY challenge claims based on PRIOR ART consisting of: patents (US and foreign); printed publications; § 311(b): grounds for IPR are limited to § 102 and § 103 challenges based on patents or printed publications ONLY; IMPORTANT: IPR cannot be used to raise § 101 (subject matter eligibility), § 112 (written description, enablement, definiteness), or § 102(a)(1) prior-use/on-sale grounds; the IPR petitioner must have NOT filed a civil action challenging the patent's validity before filing the petition (§ 315(a)); IPR STANDARD OF PROOF: preponderance of the evidence (same as examination); Aqua Products (Fed. Cir. 2017): patent owner has right to amend claims during IPR (motion to amend); PGR PROCEEDINGS — BROADER PRIOR ART (POST-GRANT REVIEW): PGR can be filed within 9 months of patent grant; PGR allows ANY invalidity ground — § 101, § 102, § 103, § 112; PGR prior art analysis thus can include: non-patent prior art (prior public use; on-sale prior art; oral disclosures); subject matter eligibility (§ 101 Alice/Mayo); written description, enablement, definiteness (§ 112); double patenting; TIMING DIFFERENCES: USPTO examination: ongoing during prosecution (years of potential back-and-forth); IPR: filed after grant; petition → institution decision (~6 months) → FWD (~12 months after institution); 18-month maximum from petition to FWD; PGR: must be filed within 9 months of grant; same timeline as IPR after institution; ESTOPPEL DIFFERENCES: IPR creates petitioner estoppel for all § 102/§ 103 grounds based on patents/printed publications that the petitioner raised OR REASONABLY COULD HAVE RAISED; PGR creates broader estoppel (extends to ALL invalidity grounds that were raised or reasonably could have been raised, not just patents/publications); district court litigation: an accused infringer who lost an IPR or PGR cannot re-litigate those same issues in district court.