US2977943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supercharged opposed piston engines
Assignee: Nordberg Manufacturing Co
•
Filing: 1955-03-23
•
Granted: 1961-04-04
•
Expires: 1975-03-23
Abstract
No abstract record available.
Inventors
- 👤 Hans U Lieberherr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:42
CPC Classifications
F; F02; F02D; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0225; F02D2700/0246; F02D2700/0248; F02D2700/0253
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1330496A
Cited
US1046738A
Cited
US1371444A
Cited
US1537128A
Cited
US1660610A
Cited
US1869455A
Cited
US2097883A
Cited
US2292233A
Cited
US2401188A
Cited
US2670595A
Cited
US2768616A
Cited
US2773490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |