US2726561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for shaping tubular stock
Assignee: Calumet and Hecla Inc
•
Filing: 1951-03-19
•
Granted: 1955-12-13
•
Expires: 1971-03-19
Abstract
No abstract record available.
Inventors
- 👤 Walter P Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:32
CPC Classifications
B; B21; B21D; B21D41/00; B21D41/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49696
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2323071A
Cited
US331528A
Cited
US339812A
Cited
US457956A
Cited
US1656324A
Cited
US172443A
Cited
US1280823A
Cited
US2313474A
Cited
US2340461A
Cited
US2434737A
Cited
US2448983A
Cited
US2443416A
Cited
US2595319A
Cited
US2519177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |