US2652478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric induction heating apparatus
Assignee: Ohio Crankshaft Co
•
Filing: 1950-01-05
•
Granted: 1953-09-15
•
Expires: 1970-01-05
Abstract
No abstract record available.
Inventors
- 👤 Howard John Christie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:06
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/60; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1377574A
Cited
GB226437A
Cited
US1997741A
Cited
US2414362A
Cited
US2349569A
Cited
US2427485A
Cited
US2448011A
Cited
US2456962A
Cited
US2453019A
Cited
US2479341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |