US2478069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced air heater
Assignee: Individual
•
Filing: 1945-12-01
•
Granted: 1949-08-02
•
Expires: 1965-12-01
Abstract
No abstract record available.
Inventors
- 👤 Leo N Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:50
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US4532A
Cited
US505697A
Cited
US692336A
Cited
US1002298A
Cited
US1098950A
Cited
US2073424A
Cited
US2291232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-01 | 1953-01-31 | 1953-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-01 | 1957-01-31 | 1957-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-01 | 1961-01-31 | 1961-08-02 | $7700.00 | Window Closed / Lapsed |