US2533508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for hot-air and water space heating with domestic water heater
Assignee: Individual
•
Filing: 1946-05-24
•
Granted: 1950-12-12
•
Expires: 1966-05-24
Abstract
No abstract record available.
Inventors
- 👤 Walter I Riu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
F; F24; F24H; F24H6/00; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1685710A
Cited
US1726921A
Cited
US688845A
Cited
US2006849A
Cited
US2163910A
Cited
US2314086A
Cited
US2269055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |