Patent US2524660A successfully refreshed from Google Patents.
US2524660A
Expired / Lapsed
US
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Watch mainspring
Assignee: Elgin National Watch Co
•
Filing: 1947-05-03
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Granted: 1950-10-03
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Expires: 1967-05-03
Abstract
No abstract record available.
Inventors
- 👤 Oscar E Harder
- 👤 Dimon A Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:42
CPC Classifications
G; G04; G04B; G04B1/00; G04B1/10; G04B1/14; G04B1/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1698935A
Cited
US1917723A
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US1949313A
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US1974695A
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US1942150A
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US2044165A
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US2103500A
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GB510154A
Cited
US2245366A
Cited
US2419825A
Cited
US2475642A
Cited
US2469718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-02 | 1954-04-03 | 1954-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-02 | 1958-04-03 | 1958-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-02 | 1962-04-03 | 1962-10-03 | $7700.00 | Window Closed / Lapsed |