US2650575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heater flue construction
Assignee: AO Smith Corp
•
Filing: 1950-03-31
•
Granted: 1953-09-01
•
Expires: 1970-03-31
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:34
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/186
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US307852A
Cited
US1107548A
Cited
US1452676A
Cited
US1802733A
Cited
US1928649A
Cited
US1995608A
Cited
US2056989A
Cited
US2084287A
Cited
US2098489A
Cited
US2232366A
Cited
US2218422A
Cited
US2549755A
Cited
US2559110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |