Patent US2774407A successfully refreshed from Google Patents.
US2774407A
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Methods of and machines for winding spiral springs
Assignee: Individual
•
Filing: 1951-04-26
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Granted: 1956-12-18
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Expires: 1971-04-26
Abstract
No abstract record available.
Inventors
- 👤 Willem J B Jansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:19
CPC Classifications
G; G04; G04D; G04D3/00; G04D3/0002; G04D3/0035; G04D3/0041; B; B21; B21F; B21F3/00; B21F3/08
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |