US4033870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual oil filter automatic switching system
Assignee: Case LLC
•
Filing: 1976-07-01
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Granted: 1977-07-05
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Expires: 1996-07-01
Abstract
Abstract A dual oil filter automatic switching system incorporating two oil filters and a switching oil valve and an oil pump, all connected together. The system also includes electric means incorporating a differential pressure switch and a latching relay, and an electric signal and an electrically-operative temperature switch are also disclosed. The oil valve is electrically responsive to the electric switching, and the valve directs the oil to either or both of the filters.
Inventors
- 👤 Donald James Parquet
- 👤 Carl Oluf Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:07
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
A dual oil filter automatic switching system comprising two oil filters, an oil valve having an oil inlet and two oil outlets and having an electrically operative movable valve closure with a plurality of oil passageways for selective fluid-flow communication of said inlet with said two outlets, fluid lines separately interconnected between said two filters and each of said two outlets for diverting the flow of oil to said filters, an oil pump in fluid-flow communication with said oil valve for supplying oil under pressure to said inlet, a differential fluid pressure electric switch, additional fluid lines separately connected to said switch and the respective oil flow inlet and outlet sides of one of said filters for transmitting oil pressure to said switch for actuation of said switch in accordance with oil pressure at said one filter, and electric connections between said switch and said electrically operative closure for moving said closure and its said passageways relative to said two outlets to thereby direct the flow of oil relative to said two filters.
Claim 2
Dependent Claim
173 words
A dual oil filter automatic switching system comprising two oil filters, an oil valve having an oil inlet and two oil outlets and having an electrically operative movable valve closure with a plurality of oil passageways for selective fluid-flow communication of said inlet with said two outlets, fluid lines separately interconnected between said two filters and each of said two outlets for diverting the flow of oil to said filters, an oil pump in fluid-flow communication with said oil valve for supplying oil under pressure to said inlet, a differential fluid pressure electric switch, additional fluid lines separately connected to said switch and the respective oil flow inlet and outlet sides of one of said filters for transmitting oil pressure to said switch for actuation of said switch in accordance with oil pressure at said one filter, and electric connections between said switch and said electrically operative closure for moving said closure and its said passageways relative to said two outlets to thereby direct the flow of oil relative to said two filters.
Claim 3
Dependent Claim
57 words
The dual oil filter automatic switching system as claimed in claim 1, wherein said oil valve is a multiple-way type valve, and said passageways include two passageways disposed in flow communication with each other at said inlet and arranged to be disposed with respective ones of said two outlets, for simultaneous fluid flow to said two filters.
Claim 4
Dependent Claim
44 words
The dual oil filter automatic switching system as claimed in claim 2, wherein said passageways include two passageways disposed free of flow communication with each other and separately positionable for respective flow communication with said inlet and a respective one of said two outlets.
Claim 5
Dependent Claim
43 words
The dual oil filter automatic switching system as claimed in claim 1, including a latching electric relay electrically connected with said fluid pressure electric switch, and an electric signal electrically connected with said relay for signalling the electric closing of said electric switch.
Claim 6
Dependent Claim
84 words
The dual oil filter automatic switching system as claimed in claim 1, including an electrically operative temperature switch fluid flow connected with said pump for receiving oil from said pump and having electric contacts which open and close in accordance with the temperature of the oil flowing to said temperature switch, and said fluid pressure electric switch and said temperature switch being electrically connected together for opening and closing the electric connection between said fluid pressure electric switch and said electrically operative valve closure.
Claim 7
Dependent Claim
42 words
The dual oil filter automatic switching system as claimed in claim 1, including an electric solenoid operatively associated with said valve closure for operating the latter, and said sensor including electric switch means operatively connected with said solenoid for energizing the latter.
Claim 8
Dependent Claim
77 words
The dual oil filter automatic switching system as claimed in claim 6, including an electrically operative temperature switch fluid flow connected with said pump for receiving oil from said pump and having electric contacts which open and close in accordance with the temperature of the oil flowing to said temperature switch, and said switch means and said temperature switch being electrically connected together for opening and closing the electric connection between said switch means and said solenoid.
Claim 9
Dependent Claim
57 words
The dual oil filter automatic switching system as claimed in claim 7, including a latching electric relay electrically connected with said switch means for maintaining an effectively closed electric connection across said switch means once said relay is electrically energized, and an electric signal electrically connected with said relay for signaling the closing of said switch means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |