Invalidity dossier
US 4657904
Sulfur-containing bis-imino carbamate compounds, pesticidal composition and use
Current assignee: Rhone Poulenc Nederland BV
Added 9/23/2026, 1:46:42 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US4657904A
Title: Sulfur-containing bis-imino carbamate compounds, pesticidal composition and use
Patent number: US4657904A
Inventor: Themistocles D. J. D'Silva
Assignee/ownership as listed: Original assignee Union Carbide Corp.; current assignee listed as Rhone Poulenc Nederland BV (per the source's own disclaimer that listed assignees "may be inaccurate"). The text also records assignments to Union Carbide Agricultural Products Company, Inc. and Rhone Poulenc Nederlands B.V.
Key dates: Priority date 1978-11-03 (claimed from US05/957,561); filing date 1986-05-16 (application US06/864,274); publication/grant 1987-04-14. Status listed as "Expired - Fee Related"; anticipated expiration 2004-04-14.
Purpose: The invention "relates to methods and compositions for controlling insect, acarid and nematode pests," and to "novel carbamate compounds and to their methods of preparation." The compounds are described as "relatively non-phytotoxic and relatively non-toxic to mammals when used in amounts sufficient to kill plant pests."
Plain-language scope: The claims concern sulfur-containing bis-imino carbamate compounds built from oxime reactants and bis-carbamoyl fluorides, defined by variable groups R, R', R1, R2, R3 (individually C1–C4 alkyl), R4, R5, R6 and R7, plus a divalent aliphatic chain "A" completing a five- or six-membered heterocyclic ring that may contain oxygen, sulfur, sulfinyl, sulfonyl, amino, alkylamino or carbonyl groups. The excerpt describes preparation via Methods I–III using an acid acceptor (organic or inorganic base) in inert, aqueous or two-phase solvent, optionally with a phase transfer agent, at about −40°C to 120°C. Pesticidal activity was evaluated against mites, nematodes, an aphid, a caterpillar, a beetle and a fly, with test suspensions at 500 ppm.
Source: https://patents.google.com/patent/[US4657904](/patent/US4657904)/en
What the excerpt does not establish: It does not provide the full claim text or claim count; complete Markush definitions and formulas (several are truncated); yield, purity or identity of specific compounds; quantitative test results; full utility data; or the complete specification, examples and drawings. It also does not establish the accuracy of the listed assignees or legal status.
Generated 10/1/2026, 9:52:51 PM
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Litigation summary
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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.