US2856969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical wire end twister
Assignee: SPRING MACHINERY Co
•
Filing: 1954-11-01
•
Granted: 1958-10-21
•
Expires: 1974-11-01
Abstract
No abstract record available.
Inventors
- 👤 Charles C Waful
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:57
CPC Classifications
B; B21; B21F; B21F33/00; B21F33/04; B21F35/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1050348A
Cited
US1199771A
Cited
US2219844A
Cited
US2439465A
Cited
US2663038A
Cited
US2679816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |