Patent US2937688A successfully refreshed from Google Patents.
US2937688A
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US
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Helical spring winding machine with terminal eye forming means
Assignee: Leggett and Platt Inc
•
Filing: 1956-09-04
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Granted: 1960-05-24
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Expires: 1976-09-04
Abstract
No abstract record available.
Inventors
- 👤 Kirchner Carl Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:49
CPC Classifications
B; B21; B21F; B21F3/00; B21F3/02; B21F3/06; B21F11/00; B21F11/005; B21F35/00; Y; Y10; Y10T; Y10T83/00; Y10T83/162; Y10T83/166; Y10T83/169; Y10T83/626; Y10T83/637
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1905459A
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US2107217A
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US2096605A
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US2388106A
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US2393804A
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US2455863A
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US2649120A
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US2676621A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |