Invalidity dossier
US 228206
luckenbice
Added 9/24/2026, 1:28:46 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 228,206
Title: "Pneumatic Grain-Conveyer" (Google Patents page header reads "luckenbice"; specification title reads "PNEUMATIC GRAIN-CONVEYER")
Inventor: Frederic A. Luckenbach (spelled "LUGKENBACH" in the specification), of New York, N.Y. The excerpt does not name an assignee.
Dates: Application filed January 22, 1880; patent dated and published June 1, 1880. The Google Patents record lists a 1897-06-01 anticipated expiration and status "Expired – Lifetime."
Stated purpose: The invention relates to apparatus "employed in elevating and transferring grain from one vessel to another or from a vessel to a store-house." Its objects are simplicity and effectiveness, reduced time and expense in transferring grain, and improving grain condition during transfer by contact with "currents of cold dry air."
Plain-language scope (from the supplied text): The invention combines a gradually contracting and expanding chamber (section E) in a grain-elevating tube with an injecting air-tube (pipe f) terminating in an adjustable annular nozzle, plus a gradually contracting chamber on a discharging tube forming a nozzle for distributing or trimming grain. Compressed air injected through the contracted section creates suction drawing grain into the lower tube (G) through a perforated tapering cap (g); grain then mingles with the air jet and is forced through the upper tube (D). Pressure is kept at about forty pounds per square inch; the contracted part's inside diameter should not exceed half the largest part's diameter, with a length four times its largest diameter; sections E and F should not exceed fifteen feet in height. Embodiments include a floating elevator (Fig. 4) and a grain-trimming nozzle (Fig. 3).
Source: https://patents.google.com/patent/[US228206](/patent/US228206)/en
What the excerpt does not establish: It provides no assignee or ownership information, no claims-based validity analysis, no litigation or license data, and no prior-art comparison beyond the patent's own description. The excerpt is partial; omitted text and drawing details may add limitations. No independent verification of the inventor-name spellings or dates was performed.
Generated 10/1/2026, 9:31:24 PM
Cases on file (0)
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Litigation summary
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Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
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
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
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.