US2445250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-circulating heater
Assignee: Individual
•
Filing: 1946-02-04
•
Granted: 1948-07-13
•
Expires: 1966-02-04
Abstract
No abstract record available.
Inventors
- 👤 Steingruber George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:35
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H3/0411; F24H3/0417
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1406912A
Cited
GB274615A
Cited
US1908559A
Cited
US1829303A
Cited
US1998670A
Cited
US1986350A
Cited
US1942758A
Cited
US2131484A
Cited
US2372832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-13 | 1952-01-12 | 1952-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-13 | 1956-01-12 | 1956-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-13 | 1960-01-12 | 1960-07-13 | $7700.00 | Window Closed / Lapsed |