Patent US2643758A successfully refreshed from Google Patents.
US2643758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for wire springs
Assignee: Universal Wire Spring Co
•
Filing: 1947-09-02
•
Granted: 1953-06-30
•
Expires: 1967-09-02
Abstract
No abstract record available.
Inventors
- 👤 Svend G Blumensaadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:08
CPC Classifications
B; B21; B21F; B21F35/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1320662A
Cited
US1324223A
Cited
US1875423A
Cited
US803859A
Cited
US1301559A
Cited
US1295769A
Cited
US1851540A
Cited
US1877111A
Cited
US1904370A
Cited
US1909499A
Cited
US2011142A
Cited
US2217333A
Cited
US2255635A
Cited
US2209472A
Cited
US2288031A
Cited
US2249996A
Cited
US2348400A
Cited
US2387674A
Cited
US2418122A
Cited
US2501224A
Cited
US2484079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |