Invalidity dossier
US 4228710
Cut-off saw attachment for machine tool
Current assignee: Individual
Added 9/23/2026, 4:19:23 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 — US 4,228,710 A
Title: Cut-off saw attachment for machine tool
Inventor: Sylvester G. Karbowski
Original/Current Assignee (per listing): Individual
Filing / Priority Date: 1979-05-23
Grant / Publication Date: 1980-10-21
Status (as listed): Expired – Lifetime; anticipated expiration 1999-05-23
Source: https://patents.google.com/patent/US4228710/en
Purpose
The attachment addresses occasional light-duty cut-off needs of small machine shops and home workshops. Per the excerpt, self-contained power saws for such work tend to be large, have their own drive motors, are relatively expensive, and consume floor space. The stated general aim is a portable, low-cost cut-off saw attachment driven by the machine tool itself rather than by a separate motor.
Plain-language scope (from the supplied text)
The attachment mounts to a machine tool having a work-support table, a movable spindle support member (quill), a rotary spindle, and coupling means (a collet) for holding a tool. The attachment comprises: a frame (guard cover plus mounting plate) releasably securable in fixed position to the quill, with a journaled drive shaft coupled to the spindle via the collet; a drive pulley/wheel on that shaft; an idler shaft supported axially parallel on the frame, carrying an idler pulley/wheel; and an endless band saw blade extending between them, with a generally rectilinear portion running through a throat region. The idler shaft rides in a slide block in a slot and is adjusted by a tensioning screw. Blade guides mounted at opposite ends of the throat region use paired rollers, one flanged to back the non-cutting edge. The attachment moves with the quill into cutting engagement and may be tilted for longer workpieces.
What the excerpt does not establish
The text is incomplete (truncated mid-discussion of the tilt embodiment), so it does not provide the full disclosure, the numbered claims, the abstract, or the complete figure descriptions. It also does not establish claim scope, validity, ownership transfers, litigation, or prior-art relationships. No research into those areas was performed.
Generated 10/1/2026, 9:50:58 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
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.