US2515786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and machine for forming pipe from flat sheets
Assignee: DOROTHY M CLIFFORD
•
Filing: 1948-02-03
•
Granted: 1950-07-18
•
Expires: 1968-02-03
Abstract
No abstract record available.
Inventors
- 👤 Arch L Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:27
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/0815; B21D; B21D5/00; B21D5/01; B21D5/015
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) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |