Patent US1981850A successfully refreshed from Google Patents.
US1981850A
Expired / Lapsed
US
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Pipe welding
Assignee: Doherty Research Co
•
Filing: 1931-06-01
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Granted: 1934-11-27
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Expires: 1951-06-01
Abstract
No abstract record available.
Inventors
- 👤 James P Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:53
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02; B23K9/0203; B23K5/00; B23K5/02; B23K5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-11-26 | 1938-05-28 | 1938-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-11-26 | 1942-05-28 | 1942-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-11-26 | 1946-05-28 | 1946-11-27 | $7700.00 | Window Closed / Lapsed |