US1889238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar heater
Assignee: AUTOMATIC ELECTRIC HEATER Co
•
Filing: 1927-05-07
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Granted: 1932-11-29
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Expires: 1947-05-07
Abstract
No abstract record available.
Inventors
- 👤 Warren F Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:35
CPC Classifications
F; F24; F24S; F24S10/00; F24S10/50; F24S10/503; F24S60/00; F24S60/30; F24S90/00; F24S90/10; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44
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) | 1935-11-29 | 1936-05-30 | 1936-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-11-29 | 1940-05-30 | 1940-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-11-29 | 1944-05-30 | 1944-11-29 | $7700.00 | Window Closed / Lapsed |