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Patent US2616993A successfully refreshed from Google Patents.
US2616993A
Expired / Lapsed
US
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Pretensioned spring
Assignee: AT&T Inc
•
Filing: 1947-07-17
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Granted: 1952-11-04
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Expires: 1967-07-17
Abstract
No abstract record available.
Inventors
- 👤 Donald C Koehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:20
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/18; F16F15/00; F16F15/02; F16F15/04; F16F15/06; F16F15/073; H; H01; H01H; H01H1/00; H01H1/12; H01H1/14; H01H1/24; H01H50/00; H01H50/54; H01H50/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1166615A
Cited
US2156465A
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US2091195A
Cited
US2112148A
Cited
US2155073A
Cited
US2282687A
Cited
US2345270A
Cited
US2301547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |