Patent US2639140A successfully refreshed from Google Patents.
US2639140A
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Variable rate spring device
Assignee: Individual
•
Filing: 1948-12-18
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Granted: 1953-05-19
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Expires: 1968-12-18
Abstract
No abstract record available.
Inventors
- 👤 Frenkel Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:24
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/12; F16F1/128; G; G05; G05G; G05G7/00; G05G7/02; G05G7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US392760A
Cited
US1037949A
Cited
US1092227A
Cited
US1208157A
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US1295638A
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US1466817A
Cited
US1878721A
Cited
GB471901A
Cited
US2143030A
Cited
US2184341A
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US2269965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |