Patent US1636173A successfully refreshed from Google Patents.
US1636173A
Expired / Lapsed
US
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Auxiliary heater for furnaces
Assignee: XXTH CENTURY HEATING AND VENTI
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Filing: 1925-11-06
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Granted: 1927-07-19
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Expires: 1945-11-06
Abstract
No abstract record available.
Inventors
- 👤 Ernst F Diehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:51
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/12; F24H9/00; F24H9/18; F24H9/1854
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) | 1930-07-18 | 1931-01-17 | 1931-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-07-18 | 1935-01-17 | 1935-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-07-18 | 1939-01-17 | 1939-07-19 | $7700.00 | Window Closed / Lapsed |