Patent US1515057A successfully refreshed from Google Patents.
Patent US3180079A successfully refreshed from Google Patents.
US3180079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for operating spark-ignition internal combustion engines
Assignee: Pure Oil Co
•
Filing: 1961-08-09
•
Granted: 1965-04-27
•
Expires: 1981-08-09
Abstract
No abstract record available.
Inventors
- 👤 Jr John H Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:27
CPC Classifications
F; F02; F02D; F02D9/00; F02D9/02; F02M; F02M17/00; F02M17/52; F02M17/525; F02D2009/0201; F02D2009/0283
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1254358A
Cited
US1642137A
Cited
FR601965A
Cited
US1916952A
Cited
US2080079A
Cited
US2091356A
Cited
US2622390A
Cited
US2784549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |