US2239447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine lubricating system
Assignee: RTX Corp
•
Filing: 1939-11-16
•
Granted: 1941-04-22
•
Expires: 1959-11-16
Abstract
No abstract record available.
Inventors
- 👤 Earle A Ryder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:40
CPC Classifications
F; F16; F16N; F16N39/00; F16N39/06; F01; F01M; F01M1/00; F01M1/02; F01M1/10; F01M11/00; F01M11/02; F01M11/03; F01M2001/1007; F01M2001/1014; Y; Y10; Y10S; Y10S494/00; Y10S494/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-04-21 | 1944-10-21 | 1945-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-21 | 1948-10-21 | 1949-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-21 | 1952-10-21 | 1953-04-22 | $7700.00 | Window Closed / Lapsed |