US2888913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating an internal combustion engine
Assignee: Gulf Research and Development Co
•
Filing: 1955-12-15
•
Granted: 1959-06-02
•
Expires: 1975-12-15
Abstract
No abstract record available.
Inventors
- 👤 Paul H Emmett
- 👤 Roderick S Spindt
- 👤 Donald R Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:37
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
NL44251C
Cited
US2149033A
Cited
US1669181A
Cited
US1883593A
Cited
US1973474A
Cited
US1878401A
Cited
US1919825A
Cited
GB364533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |