US2881972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure chargers for internal combustion engines
Assignee: Ruston and Hornsby Ltd
•
Filing: 1955-09-12
•
Granted: 1959-04-14
•
Expires: 1975-09-12
Abstract
No abstract record available.
Inventors
- 👤 Geoffrey B R Feilden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:30
CPC Classifications
F; F02; F02C; F02C6/00; F02C6/04; F02C6/10; F02C6/12; F01; F01D; F01D25/00; F01D25/16; F01D25/166
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US704038A
Cited
US743693A
Cited
US2117131A
Cited
US2577179A
Cited
US2492672A
Cited
GB630842A
Cited
US2577134A
Cited
US2684196A
Cited
US2646210A
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 |