Patent US2064971A successfully refreshed from Google Patents.
US2064971A
Expired / Lapsed
US
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Heating unit and the production thereof
Assignee: Thomas A Edison Inc
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Filing: 1932-01-13
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Granted: 1936-12-22
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Expires: 1952-01-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas A Edison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/28; H05B3/30; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087
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) | 1939-12-22 | 1940-06-22 | 1940-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-12-22 | 1944-06-22 | 1944-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-12-22 | 1948-06-22 | 1948-12-22 | $7700.00 | Window Closed / Lapsed |