US3429303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine with improved intake and exhaust
Assignee: Individual
•
Filing: 1967-02-23
•
Granted: 1969-02-25
•
Expires: 1987-02-23
Abstract
No abstract record available.
Inventors
- 👤 Charles G Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:50
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4285; F01; F01N; F01N13/00; F01N13/14; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02M; F02M1/00; F02B2275/00; F02B2275/34; F02F2001/244; F02F2001/247; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4392
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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |