US3073451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine oil filter indicator systems
Assignee: Motors Liquidation Co
•
Filing: 1960-04-18
•
Granted: 1963-01-15
•
Expires: 1980-04-18
Abstract
No abstract record available.
Inventors
- 👤 Clair D Stephenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:12
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D27/00; B01D27/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
AN ENGINE OIL FILTER INDICATOR SYSTEM INCLUDING A CASING, A FILTER ELEMENT IN SAID CASING, AN INLET TO AND AN OUTLET FROM SAID CASING, A NORMAL PATH FOR ENGINE OIL WITHIN SAID CASING LEADING FROM SAID INLET AND THROUGH SAID FILTER ELEMENT TO SAID OUTLET, A BYPASS LEADING FROM SAID INLET AND AROUND SAID FILTER ELEMENT TO SAID OUTLET, PRESSURE ACTUATED MEANS IN SAID BYPASS AND ARRANGED TO OPEN UPON AN INCREASE IN PRESSURE IN SAID INLET, TWO THERMALLY RESPONSIVE SWITCHES EACH HAVING A HEAT TRANSFER SURFACE FIXED IN POSITION AS A SHIELD AGAINST OIL IN SAID CASING, ONE OF SAID SWITCHES BEING MOUNTED ON THE INLET SIDE OF SAID FILTER ELEMENT AND BEING CLOSED WHEN COLD AND OPEN WHEN HOT, THE OTHER OF SAID SWITCHES BEING MOUNTED ON THE OUTLET SIDE OF SAID FILTER ELEMENT AND OPEN WHEN COLD AND CLOSED WHEN
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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |