Patent US2441580A successfully refreshed from Google Patents.
US2441580A
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Method of forming screw threads
Assignee: Lear Inc
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Filing: 1945-12-08
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Granted: 1948-05-18
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Expires: 1965-12-08
Abstract
No abstract record available.
Inventors
- 👤 Mageoch Harry Yale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:08
CPC Classifications
B; B21; B21K; B21K25/00; B21K1/00; B21K1/56; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49881; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49929; Y10T29/49938; Y10T29/4994; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19721
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US168214A
Cited
US543607A
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US1190893A
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US1212608A
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US1744199A
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US1812151A
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US2216686A
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US2232973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-18 | 1951-11-17 | 1952-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-18 | 1955-11-17 | 1956-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-18 | 1959-11-17 | 1960-05-18 | $7700.00 | Window Closed / Lapsed |