US2528810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heating and welding
Assignee: Chain Belt Co
•
Filing: 1945-07-21
•
Granted: 1950-11-07
•
Expires: 1965-07-21
Abstract
No abstract record available.
Inventors
- 👤 Harold L Zimmerman
- 👤 Frederick J Van Zeeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:19
CPC Classifications
B; B23; B23K; B23K13/00; H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1915047A
Cited
US1929212A
Cited
US2024906A
Cited
US2139211A
Cited
US2371459A
Cited
US2385904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |