Patent US2070696A successfully refreshed from Google Patents.
Patent US2137909A successfully refreshed from Google Patents.
US2137909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double spot welding
Assignee: Individual
•
Filing: 1937-05-10
•
Granted: 1938-11-22
•
Expires: 1957-05-10
Abstract
No abstract record available.
Inventors
- 👤 Hagedorn Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:06
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/10; B23K11/11
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1941-11-21 | 1942-05-23 | 1942-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-11-21 | 1946-05-23 | 1946-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-11-21 | 1950-05-23 | 1950-11-22 | $7700.00 | Window Closed / Lapsed |