US2273609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heating
Assignee: American Optical Corp
•
Filing: 1939-10-31
•
Granted: 1942-02-17
•
Expires: 1959-10-31
Abstract
No abstract record available.
Inventors
- 👤 William J Wrighton
- 👤 Tracy C Jarrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:07
CPC Classifications
B; B23; B23K; B23K13/00
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) | 1945-02-16 | 1945-08-18 | 1946-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-16 | 1949-08-18 | 1950-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-16 | 1953-08-18 | 1954-02-17 | $7700.00 | Window Closed / Lapsed |