Patent US2439239A successfully refreshed from Google Patents.
US2439239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cabin supercharger regulator system
Assignee: General Electric Co
•
Filing: 1945-04-12
•
Granted: 1948-04-06
•
Expires: 1965-04-12
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Crever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:48
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0261; B; B64; B64D; B64D13/00; B64D13/02; B64D13/04; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1060208A
Cited
US1531592A
Cited
US1579038A
Cited
US1924190A
Cited
US2022535A
Cited
US2011655A
Cited
US2298977A
Cited
US2367981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |