US3485218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston machines
Assignee: National Research Development Corp UK
•
Filing: 1967-10-04
•
Granted: 1969-12-23
•
Expires: 1987-10-04
Abstract
No abstract record available.
Inventors
- 👤 John Michael Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:08
CPC Classifications
F; F01; F01C; F01C9/00; F01C9/005; F02; F02B; F02B53/00; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2730/00; F02B2730/01; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |