US2833268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined air and water heater
Assignee: Individual
•
Filing: 1954-09-16
•
Granted: 1958-05-06
•
Expires: 1974-09-16
Abstract
No abstract record available.
Inventors
- 👤 Albert E Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:02
CPC Classifications
F; F24; F24H; F24H6/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US564402A
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US1948735A
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US2020686A
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US796839A
Cited
US1458876A
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US1740068A
Cited
US1983843A
Cited
US2163910A
Cited
US2269055A
Cited
US2533508A
Cited
US2529977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |