Patent US1962842A successfully refreshed from Google Patents.
US1962842A
Expired / Lapsed
US
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Electrical heating system
Assignee: JOHN C MCDONALD
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Filing: 1931-03-26
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Granted: 1934-06-12
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Expires: 1951-03-26
Abstract
No abstract record available.
Inventors
- 👤 Lynott B Root
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:13
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; H05B6/108
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) | 1937-06-11 | 1937-12-11 | 1938-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-06-11 | 1941-12-11 | 1942-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-06-11 | 1945-12-11 | 1946-06-12 | $7700.00 | Window Closed / Lapsed |