US2581673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous method of making butt weld tubing
Assignee: National Electric Products Corp
•
Filing: 1948-12-27
•
Granted: 1952-01-08
•
Expires: 1968-12-27
Abstract
No abstract record available.
Inventors
- 👤 Frank J Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:00
CPC Classifications
B; B23; B23K; B23K5/00; B23K5/02; B23K5/06; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5185
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1402997A
Cited
US1402996A
Cited
US1491128A
Cited
US1481887A
Cited
US1706393A
Cited
US1650607A
Cited
US1765368A
Cited
US1893926A
Cited
US2024485A
Cited
US1996775A
Cited
GB430592A
Cited
US1997538A
Cited
US2037608A
Cited
US2052862A
Cited
US2131701A
Cited
US2277473A
Cited
US2265129A
Cited
GB552126A
Cited
US2414874A
Cited
US2960523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |