Patent US2794477A successfully refreshed from Google Patents.
US2794477A
Expired / Lapsed
US
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Method and apparatus for making coiled springs
Assignee: Individual
•
Filing: 1953-02-05
•
Granted: 1957-06-04
•
Expires: 1973-02-05
Abstract
No abstract record available.
Inventors
- 👤 Curt H K Sjobohm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:10
CPC Classifications
B; B21; B21F; B21F23/00; B21D; B21D11/00; B21D11/10; B21F3/00; B21F3/02; B21F3/04; B21F35/00; B21F35/02
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) | 1960-06-03 | 1960-12-03 | 1961-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-03 | 1964-12-03 | 1965-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-03 | 1968-12-03 | 1969-06-04 | $7700.00 | Window Closed / Lapsed |