US2451625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air pressure responsive control for internal-combustion heaters
Assignee: Stewart Warner Corp
•
Filing: 1943-12-13
•
Granted: 1948-10-19
•
Expires: 1963-12-13
Abstract
No abstract record available.
Inventors
- 👤 Jr William A Marshall
- 👤 John H Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:42
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D13/08; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/2012; Y10T137/6416; Y10T137/6443; Y10T137/7722; Y10T137/7737; Y10T137/7837; Y10T137/7904; Y10T137/7905
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |