Invalidity dossier
US 5154993
Added 9/20/2026, 5:14:02 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US5154993A
Title: "Electrode strips for coiled assemblies and method of producing them"
Patent number: US5154993A (application US07/515,557)
Inventor: Theodore R. Beatty
Original assignee: Eveready Battery Co Inc. (later listed assignees per the source: Congress Financial Corp Florida and Edgewell Personal Care Brands LLC)
Dates: Priority/filing date 1990-04-27; publication/grant 1992-10-13; anticipated expiration 2010-04-27. Legal status shown as "Expired - Lifetime." An EP counterpart, EP0454419B1, is listed with a 1991-04-23 priority entry.
Purpose and plain-language scope (per the supplied text only): The invention "relates to an electrode strip having a clean selected area onto which a first conductive tab is superimposed over said selected area on one side of the electrode strip and a second conductive tab is superimposed over the opposite side of said selected area and said conductive tabs are secured together and to the selected area." It also "relates to a method of producing the conductive tab connected electrode strip." In context, the strip is for rolled/coiled ("jelly roll") electrode assemblies in galvanic cells, preferably nickel-cadmium cells, where a conductive tab connects an electrode to a housing portion serving as a terminal. The stated chemistry context includes nickelous hydroxide (positive), cadmium hydroxide (negative), and potassium hydroxide electrolyte; other listed systems include Leclanche, alkaline MnO2, nickel-iron, nickel-zinc, and nickel-hydrogen. Classifications cover wound/folded-electrode dry cells (H01M6/10) and electrode tabs/connections inside casings (H01M50/531, H01M50/534, H01M50/536).
Source: https://patents.google.com/patent/[US5154993](/patent/US5154993)/en
What the excerpt does not establish: It does not include the full claims, the complete detailed description, drawings, or the precise method steps, tab materials, welding/securing details, and cleaning steps (only keyword-level mentions appear). The listed assignees are stated by the source to be possible rather than verified, and the priority date is expressly an assumption. No litigation, ownership-transfer, validity, or prior-art conclusions are established here.
(≈330 words)
Generated 10/1/2026, 10:03:01 PM
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Litigation summary
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Proceedings on file (0)
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No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
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
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.