US2750486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door mechanism for induction heating apparatus
Assignee: LOMBARD CORP
•
Filing: 1953-03-10
•
Granted: 1956-06-12
•
Expires: 1973-03-10
Abstract
No abstract record available.
Inventors
- 👤 Charles N Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:02
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1457907A
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US2325638A
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US2329138A
Cited
US2452035A
Cited
US2466137A
Cited
US2474505A
Cited
US2676234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |