Invalidity dossier
US 153068
Improvement in cotton-presses
Added 9/24/2026, 1:37:18 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 153,068
Title: Improvement in Cotton-Presses
Patentee: George W. Grader, of Marblehead, Essex County, Massachusetts (spelled "GEORGE V. GRADER" in the OCR'd heading and "GEORGE XY. GRADER" in the body; the correct reading is not established by this excerpt)
Patent number: US 153,068
Dated: July 14, 1874
Application filed: May 20, 1874
Source: https://patents.google.com/patent/[US153068](/patent/US153068)/en
Purpose. The invention addresses a strength problem in the cotton press described in the patentee's earlier Patent No. 119,346 (granted September 26, 1871). In operating such machines, the teeth of the racks and sectors could not be made strong enough to sustain the great pressure imposed on them, because tooth length was necessarily limited.
Plain-language scope. Two improvements are described:
- Reinforced teeth. The rack teeth (a a) and sector teeth (b b) are each formed with convex projections (c) at the back. This strengthens the bases of the teeth without increasing their length or spacing, since the shorter or thinner tooth points of the rack engage the contracted cavities between the bases of the sector teeth, and vice versa.
- Widened lower portions. The lower parts of the rack and sectors are made of increased width, adding to the length and therefore the strength of the teeth that must bear the increased strain of the engine in a press built as described in the earlier patent.
Additional elements: guiding-tongues (D) project from the sides of the rack and work in grooves or guideways in the press-frame; shroudings (E on the rack, F on the sectors) extend on the edges to the pitch-line of the teeth, so the sector shroudings roll on the straight rack shroudings in operation.
The claim as printed reads: "1. The combination of the rack A and sectors B B, constructed with teeth a a b b, re—" and is truncated in the supplied text.
Not established by this excerpt. Assignee; the full text of the claim; whether additional claims exist; the contents of Patent No. 119,346; and any details of the drawings beyond the three figure descriptions.
Generated 10/1/2026, 9:31:15 PM
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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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