US2685875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warm air heating furnace
Assignee: Jackson and Church Co
•
Filing: 1950-01-14
•
Granted: 1954-08-10
•
Expires: 1970-01-14
Abstract
No abstract record available.
Inventors
- 👤 Hermann H H Eichhorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:52
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/10; F24H3/105
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US559918A
Cited
US924815A
Cited
US1634706A
Cited
US1935852A
Cited
US2157643A
Cited
US2299901A
Cited
US2402595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |