US2666723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing helical coil compression springs
Assignee: Associated Spring Corp
•
Filing: 1951-12-19
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Granted: 1954-01-19
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Expires: 1971-12-19
Abstract
No abstract record available.
Inventors
- 👤 Elliott W Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:26
CPC Classifications
B; B21; B21F; B21F3/00; C; C21; C21D; C21D9/00; C21D9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2261878A
Cited
US2332826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |