US1681956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making electrical heaters
Assignee: HUDSON HEATING SYSTEMS Inc
•
Filing: 1926-12-27
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Granted: 1928-08-28
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Expires: 1946-12-27
Abstract
No abstract record available.
Inventors
- 👤 Robert L Shriner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:59
CPC Classifications
H; H05; H05B; H05B3/00; F; F24; F24H; F24H9/00; F24H9/0005; F24H9/001; F24H9/0015; F24H9/0021; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49096; Y10T29/49826; Y10T29/49861; Y10T29/49881
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) | 1931-08-28 | 1932-02-27 | 1932-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-08-28 | 1936-02-27 | 1936-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-08-28 | 1940-02-27 | 1940-08-28 | $7700.00 | Window Closed / Lapsed |