US3489676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel oil treatment and lubricating oil filters for internal combustion engines
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1967-09-05
•
Granted: 1970-01-13
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Expires: 1987-09-05
Abstract
No abstract record available.
Inventors
- 👤 Shih-En Hu
- 👤 Jerome Geyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:40
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0091; B; B01; B01D; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1594335A
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US1914999A
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US2310305A
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US2262526A
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US2455659A
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US3000819A
Cited
US2842112A
Cited
US2852454A
Cited
US3080214A
Cited
US3278040A
Cited
US3336223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |