US3370708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual element, dual valve, twist-on type filter assembly
Assignee: Champion Laboratories Inc
•
Filing: 1966-03-16
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Granted: 1968-02-27
•
Expires: 1986-03-16
Abstract
No abstract record available.
Inventors
- 👤 William H Hultgren
- 👤 Hall Robert Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:00
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/04; B01D27/06; B01D27/10; B01D27/103; B01D27/106; B01D27/108; B01D27/14; B01D27/142; B01D27/144
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2387368A
Cited
US2877902A
Cited
US3184062A
Cited
US3283904A
Cited
US3232437A
Cited
US3211292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |