Patent US4790753A successfully refreshed from Google Patents.
Patent US2881687A successfully refreshed from Google Patents.
US2881687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air supply system
Assignee: Surface Combustion Corp
•
Filing: 1952-05-21
•
Granted: 1959-04-14
•
Expires: 1972-05-21
Abstract
No abstract record available.
Inventors
- 👤 Paul A Manor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/042; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6855; Y10T137/6906; Y10T137/8593; Y10T137/87265; Y10T137/87499
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US184240A
Cited
US594056A
Cited
US1873138A
Cited
US2064587A
Cited
US2377794A
Cited
US2393042A
Cited
US2466851A
Cited
US2409433A
Cited
US2584889A
Cited
FR902062A
Cited
US2487226A
Cited
US2598207A
Cited
CH258092A
Cited
US2653754A
Cited
US2687145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |