Patent US2458968A successfully refreshed from Google Patents.
US2458968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion heater having means to prevent fuel contamination of the ventilating air
Assignee: Stewart Warner Corp
•
Filing: 1943-11-06
•
Granted: 1949-01-11
•
Expires: 1963-11-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Lynn A Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:21
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D13/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1379180A
Cited
US1567608A
Cited
US1640728A
Cited
US1620754A
Cited
US1636616A
Cited
US1936003A
Cited
US2144129A
Cited
US2240531A
Cited
US2270631A
Cited
US2386746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |