Invalidity dossier
US 147127
Improvement in lifting-jacks
Added 9/24/2026, 12:54:33 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 147,127
Title: Improvement in Lifting-Jacks
Patentee: James T. Guthrie, of Leesburg, Ohio. No assignee is named in the supplied text.
Dates: Application filed January 6, 1874; Letters Patent dated February 3, 1874 (the specification text prints the number as "147,125," but the publication number is US147127A). Anticipated expiration February 3, 1891; status listed as "Expired – Lifetime."
Purpose. The stated object is "to render the lifting-jack durable in its jointed connections, and to cheapen its construction, with entire convenience and safety in applying it."
Plain-language scope. The jack combines a hand-lever (A) with angle-irons (B) bolted to its sides and pivoted to a base (C) by bolt a, aligned with or near the lever's inner side. The free branches (D) of the angle-irons project at an acute angle to the lever and are jointed by bolt b to the lower end of a vertical supporting-standard (E). When the lever is depressed to raise the axle, the acute branches swing the standard's pivot (b) upward and in front of the base pivot (a), over the lever, so the weight of the raised object holds the lever down (Fig. 2). The standard has notches (c) on its outer face; an extensible standard (F) slides within a guide-strap (G) and is held by a link (H) resting obliquely in the notches, for axles higher than the main standard. To apply the jack, the lever is raised vertical against the standard, the extensible bar lying between the lever and jointed bar. The angle-irons may be solid (Figs. 1–2) or braced (H, Fig. 3).
Claim. "The acute angle-irons B D, jointed to the base O and to the supporting-standard E, in combination with the base O, the hand-jointed lever A, the standard E, and the extensible bar F, substantially as described."
Source: https://patents.google.com/patent/[US147127](/patent/US147127)/en
What the excerpt does not establish: It gives no assignee, no inventor residence beyond Leesburg, Ohio, no claims beyond the single claim quoted, and no drawing content except as described in words; the digitized text contains OCR errors (e.g., "147,125," "lit'tingjaek"). It also does not establish any legal conclusion about validity or ownership.
Generated 10/1/2026, 9:31:41 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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