US2512909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve engine
Assignee: Individual
•
Filing: 1946-08-07
•
Granted: 1950-06-27
•
Expires: 1966-08-07
Abstract
No abstract record available.
Inventors
- 👤 Leslie W Beaven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:20
CPC Classifications
F; F02; F02B; F02B57/00; F02B57/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US915828A
Cited
US895653A
Cited
GB191028590A
Cited
GB191015839A
Cited
US1093659A
Cited
US1213315A
Cited
US1236472A
Cited
US1328484A
Cited
GB146543A
Cited
US1642596A
Cited
US2417894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-26 | 1953-12-26 | 1954-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-26 | 1957-12-26 | 1958-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-26 | 1961-12-26 | 1962-06-27 | $7700.00 | Window Closed / Lapsed |