Patent US3475905A successfully refreshed from Google Patents.
US3475905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Individual
•
Filing: 1967-01-23
•
Granted: 1969-11-04
•
Expires: 1987-01-23
Abstract
No abstract record available.
Inventors
- 👤 Edward Burke Wilford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:20
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F02; F02D; F02D9/00; F02D9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124930A
Cited
US890272A
Cited
US1416352A
Cited
US2293632A
Cited
US3116725A
Cited
US3406515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |