US1998255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary power engine
Assignee: EXPLOROTOR A G
•
Filing: 1930-11-08
•
Granted: 1935-04-16
•
Expires: 1950-11-08
Abstract
No abstract record available.
Inventors
- 👤 Silbermann Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:59
CPC Classifications
F; F02; F02C; F02C5/00; F02C5/02; F02C5/04; F02C3/00; F02C3/14; F02C3/16; F02C3/165
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) | 1938-04-15 | 1938-10-15 | 1939-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-15 | 1942-10-15 | 1943-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-15 | 1946-10-15 | 1947-04-16 | $7700.00 | Window Closed / Lapsed |