Invalidity dossier
US 11759915
Pneumatic latch clamp
Current assignee: Stabilus Motion Controls GmbH
Added 9/20/2026, 5:23:13 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 11759915 B2
Title: Pneumatic latch clamp
Patent number: US 11759915 B2
Application number: US17/492,620 (filed 2021-10-03)
Priority date: 2021-10-03 (assumed)
Publication date: 2023-09-19 (granted same date)
Inventor: Matthew Rentz
Original assignee: Delaware Capital Formation, Inc.
Current assignee (per source): Stabilus Motion Controls GmbH
Anticipated expiration: 2041-10-03 (per source)
Status: Active (source's legal-status assumption)
Source: https://patents.google.com/patent/US11759915/en
Purpose: The disclosure seeks a power clamp overcoming prior-art deficiencies — usable in harsh environments while keeping lubricants inside the clamp, presenting a clean appearance, and, via composite material, not requiring lubrication so drive operation does not attract dust or debris. It is intended to operate in various orientations with a solid feel, to permit manual positioning/operation when required, and to allow left- or right-side mounting.
Plain-language scope (from the excerpt): A power clamp comprises a body, a piston assembly with an actuation mechanism and movable piston rod, a linkage housed in the body and movably coupled with the piston rod, a plunger movably coupled with the linkage, and a clamp hook coupled with the plunger to move between release and clamped positions. The linkage includes first, second and third links; the first is pivotally connected to the body and second link; the second link pivotally connects with the plunger; the third link is coupled with the first and second links and to the piston rod via a pin. A second pin coupled with the second link and plunger moves in a track (slot) in the body. A pivotable trunnion with a composite bearing supports the plunger; the body may be plastic with metal side cover plates and mounting plates. A post on the first link carries a manual clamp handle; a release handle with a fourth link and return spring is described. Sensors sense piston/clamp operation.
What the excerpt does not establish: It does not establish claim numbering or exact claim language, the full specification, any prior art, litigation, validity, enforceability, or the accuracy of ownership/legal-status data; the text notes the excerpt is partial and omitted text should be consulted in the source.
Generated 10/1/2026, 10:02:43 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.