Patent US2278254A successfully refreshed from Google Patents.
US2278254A
Expired / Lapsed
US
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Apparatus for forming heating coils
Assignee: PRODUCTION PLATING WORKS Inc
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Filing: 1939-11-17
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Granted: 1942-03-31
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Expires: 1959-11-17
Abstract
No abstract record available.
Inventors
- 👤 Winford L Enghauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:34
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21D; B21D11/00; B21D11/06; B21D11/07
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) | 1945-03-30 | 1945-09-29 | 1946-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-30 | 1949-09-29 | 1950-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-30 | 1953-09-29 | 1954-03-31 | $7700.00 | Window Closed / Lapsed |