US2752912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced air flow air heating furnace
Assignee: JET HEET Inc
•
Filing: 1954-06-08
•
Granted: 1956-07-03
•
Expires: 1974-06-08
Abstract
No abstract record available.
Inventors
- 👤 Calvin D Maccracken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:29
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US516017A
Cited
GB190509421A
Cited
DE406319C
Cited
US1588789A
Cited
US1583238A
Cited
US1707531A
Cited
US1755727A
Cited
US2383431A
Cited
US2374203A
Cited
US2462395A
Cited
US2630110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-03 | 1960-01-02 | 1960-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-03 | 1964-01-02 | 1964-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-03 | 1968-01-02 | 1968-07-03 | $7700.00 | Window Closed / Lapsed |