Invalidity dossier
US 4323557
Pressure-sensitive adhesive containing iodine
Current assignee: 3M Co
Added 9/23/2026, 5:42:35 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US4323557A — Pressure-Sensitive Adhesive Containing Iodine
Title: Pressure-sensitive adhesive containing iodine
Patent number: US4323557A
Application number: US06/062,362
Inventors: Paul D. Rosso; Michael Y. Moss
Original assignee: Minnesota Mining and Manufacturing Co. (3M Co listed as current assignee)
Priority/filing date: 1979-07-31
Publication/grant date: 1982-04-06
Legal status: Expired – Lifetime (anticipated expiration 1999-07-31)
Purpose (plain language): The patent concerns a pressure-sensitive adhesive formulation that incorporates iodine, evidently to give the adhesive antimicrobial or antiseptic properties. The excerpt's indexing points to a mixture, an antimicrobial effect, and an "acidificating" effect as recurring concepts, and lists iodine, iodide ion, hydrogen iodide, polyvinylpyrrolidone (povidone-iodine), and N-vinyl-2-pyrrolidone among associated materials.
Scope indicators from the excerpt: The extracted text references 20 claim-related occurrences of "pressure-sensitive adhesive," plus claims mention of mixture, substance, method, iodine, anti-microbial effect, and acidificating effect. Description-level terms include dermatologically acceptable, solvent, adhesive, antimicrobial, hydrogen iodide, iodide ion, sodium iodide, potassium iodide, and skin irritation. Exemplary materials named in the description include isooctyl acrylate (6-methylheptyl prop-2-enoate), n-vinyl-2-pyrrolidone, ethanol, ethyl acetate, toluene-4-sulfonic acid, agar, and polyethylene. Test organisms named include Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus subtilis, Candida albicans, and Saccharomyces cerevisiae, suggesting antimicrobial assay data (agar assay) appears in the specification. These are indexing/term counts, not verbatim claim language.
What the excerpt does not establish: The full text of the claims; claim dependencies or exact numerical ranges; iodine concentration limits; the precise composition of any example; whether antimicrobial efficacy is quantified; and any comparative results. The excerpt is explicitly marked as partial. No litigation, ownership-transfer, validity, or prior-art conclusions are drawn here.
Source: https://patents.google.com/patent/[US4323557](/patent/US4323557)/en
Generated 10/1/2026, 9:43:22 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
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Obviousness
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Extensions
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.