US2857897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine manifold scavenging control
Assignee: Individual
•
Filing: 1956-11-05
•
Granted: 1958-10-28
•
Expires: 1976-11-05
Abstract
No abstract record available.
Inventors
- 👤 Albert G H Vanderpoel
- 👤 Mitchell Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:41
CPC Classifications
F; F02; F02M; F02M1/00; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4392; Y; Y10; Y10S; Y10S60/00; Y10S60/90
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |