Patent US5332973A successfully refreshed from Google Patents.
Patent US2918271A successfully refreshed from Google Patents.
US2918271A
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Twisted spring elements
Assignee: Rockwell-Standard Corp
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Filing: 1956-08-02
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Granted: 1959-12-22
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Expires: 1976-08-02
Abstract
No abstract record available.
Inventors
- 👤 Nelson A Crites
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:24
CPC Classifications
B; B21; B21F; B21F35/00; B21F35/003; A; A47; A47C; A47C7/00; A47C7/02; A47C7/28; A47C7/32; B21D; B21D11/00; B21D11/14; B21F7/00; F; F16; F16F; F16F1/00; F16F1/02; F16F1/024; F16F1/04; F16F7/00; F16F7/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609; Y10T29/49611; Y10T29/49613; Y10T29/49826; Y10T29/49863; Y10T29/49874
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US99475A
Cited
US274715A
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US1700170A
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US1759410A
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US2079873A
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US2257648A
Cited
US2403145A
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US2650819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |