US2748734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous tube welding apparatus with multi-stage heating
Assignee: National Electric Products Corp
•
Filing: 1950-11-09
•
Granted: 1956-06-05
•
Expires: 1970-11-09
Abstract
No abstract record available.
Inventors
- 👤 Frank J Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:19
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1319862A
Cited
US1652396A
Cited
US679469A
Cited
US706031A
Cited
US829990A
Cited
US1184947A
Cited
US1893926A
Cited
US1960523A
Cited
US1904599A
Cited
US2014982A
Cited
US1984720A
Cited
GB392460A
Cited
US2024485A
Cited
US2127618A
Cited
US2178451A
Cited
US2131701A
Cited
US2177104A
Cited
US2196639A
Cited
US2205821A
Cited
US2219493A
Cited
US2209373A
Cited
US2302163A
Cited
US2214157A
Cited
US2277658A
Cited
US2308850A
Cited
US2370387A
Cited
US2366243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |