Invalidity dossier

US 4387297

Portable laser scanning system and scanning methods

Current assignee: PSC Inc.

Added 9/24/2026, 8:53:31 AM

At a glanceNo PTAB challenges3 lawsuits on fileasserted by PSC Inc.

Active provider: DeepSeek · deepseek-v4-flash

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Patent summary

Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.

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Cases on file (3)

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Specific litigation cases in our database that name US patent 4387297. The free-form analysis below may also discuss cases beyond this list.

Lawsuits filed per year

Cases asserting US 4387297, by filing year.

PSC Inc. v. Symbol Technologies, Inc. et al.filed Apr 1, 1996
96-CV-6152TU.S. District Court, W.D.N.Y.patent misuse/unenforceability holding; patent issues settled
Defendants: Symbol Technologies, Inc., Data General Corp.
Other patents asserted: 4593186
Symbol Technologies, Inc. v. Metrologic Instruments, Inc. et al.filed Jan 26, 1988
88-0461U.S. District Court, D.N.J.partial summary judgment; final disposition unverified
Defendants: Metrologic Instruments, Inc., C. Harry Knowles
Other patents asserted: 4593186
Symbol Technologies, Inc. v. Opticon, Inc. et al.filed Nov 14, 1986
86-8736U.S. District Court for the Southern District of New York; appeal to U.S. Court of Appeals for the Federal Circuit (No. 90-1409)judgment for plaintiff, affirmed on appeal
Defendants: Opticon, Inc., Opto Electronics Co., Ltd.
Other patents asserted: 4409470, 4593186

Litigation summary

Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.

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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.

Current assignee: PSC Inc.

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.

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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.

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Prior art

Earlier patents, publications, and products that may anticipate or render the claims unpatentable.

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Obviousness

Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.

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Extensions

Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.

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Derivative works

Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.

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Keep exploring

More patents asserted by Symbol Technologies, Inc.

This patent in court (3)

3 tracked lawsuits name US 4387297.