Patent US3895954A successfully refreshed from Google Patents.
US3049964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical oil change indicator
Assignee: Phillips Petroleum Co
•
Filing: 1959-08-10
•
Granted: 1962-08-21
•
Expires: 1979-08-10
Abstract
No abstract record available.
Inventors
- 👤 Elmer C Miller
- 👤 Francis W Karasek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:33
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/251
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1854143A
Cited
US1967583A
Cited
US2060957A
Cited
US2302224A
Cited
US2311101A
Cited
US2542299A
Cited
US2578722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |