Patent US2609680A successfully refreshed from Google Patents.
US2609680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hair spring and balance wheel timing mechanism
Assignee: Individual
•
Filing: 1948-01-08
•
Granted: 1952-09-09
•
Expires: 1968-01-08
Abstract
No abstract record available.
Inventors
- 👤 Caldwell Forrest Julian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:10
CPC Classifications
G; G04; G04D; G04D7/00; G04D7/12; G04D7/1257; G04D7/1271; G04D7/1285
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |