Invalidity dossier
US 3461103
Water dispersible polyurethane plastics prepared from cyclic compounds
Current assignee: Bayer AG
Added 9/23/2026, 5:46:12 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US3461103A — Concise Patent Overview
Title: Water dispersible polyurethane plastics prepared from cyclic compounds
Patent number: US3461103A
Assignee (original and current, as listed): Bayer AG
Inventors: Wolfgang Keberle, Dieter Dieterich, Otto Bayer
Prior art date / priority date: 1964-09-26 (noted as an assumption)
Filing date: 1965-09-24
Publication (grant) date: 1969-08-12
Application number: US490117A
Legal status: Expired – Lifetime; anticipated expiration 1986-08-12 (status stated as an assumption, not a legal conclusion)
Purpose and plain-language scope (from the supplied text):
The patent concerns water dispersible polyurethane plastics prepared from cyclic compounds. The disclosed process involves reacting polyisocyanates and polyhydroxy compounds (e.g., polyesters, glycols) to build polyurethane, incorporating cyclic compounds and acid/salt components to impart dispersibility, then dispersing the product in water. The recycled "prior art keywords" indicate the core subject matter: acid, grams, groups, polyurethane, compounds. Frequently referenced materials include acetone and tert-butanol as solvents, triethylamine and sodium hydroxide as bases, amino hydrogens, and cyclic compounds such as sultones (e.g., 1,3-propane sultone) and anhydrides (e.g., succinic anhydride). Numerous diols, diacids, diamines, and polyamines appear, consistent with polyurethane/chain-extender chemistry. The dispersions are described in connection with evaporation, drying, films, foils, and cross-linking, suggesting utility as coatings or film-forming compositions.
What the supplied excerpt does NOT establish:
- The full text or exact wording of any claim, particularly the independent claim scope.
- The precise identity or boundaries of the "cyclic compounds" recited in the claims.
- Chemical structures, ratios, or conditions beyond those inferable from the keyword and compound lists.
- Any finding on validity, infringement, patentability, or enforceability.
- Any litigation, ownership transfer, or license history.
- The accuracy of assignee, dates, or legal status, which the source itself labels assumptions.
Source: https://patents.google.com/patent/[US3461103](/patent/US3461103)/en
Generated 10/1/2026, 9:43:18 PM
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Litigation summary
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Proceedings on file (0)
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PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.