Patent US2402186A successfully refreshed from Google Patents.
US2402186A
Expired / Lapsed
US
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Progressive induction heating apparatus
Assignee: Federal Telephone and Radio Corp
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Filing: 1943-04-05
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Granted: 1946-06-18
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Expires: 1963-04-05
Abstract
No abstract record available.
Inventors
- 👤 Vernon W Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:20
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/32
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) | 1949-06-17 | 1949-12-17 | 1950-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-17 | 1953-12-17 | 1954-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-17 | 1957-12-17 | 1958-06-18 | $7700.00 | Window Closed / Lapsed |