US3586169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-filtering unit
Assignee: Duluth Filter Co
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Filing: 1969-08-07
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Granted: 1971-06-22
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Expires: 1989-08-07
Abstract
Abstract A compact filtering unit is provided which includes a reservoir tank divided into three compartments by a first and second spaced baffle plates. The first compartment includes a strainer basket for receiving oil to be filtered, oil from the first compartment, after passing through the strainer basket, flowing over the first baffle plate into the second compartment. Oil in the second compartment is pumped through a lower outlet to a filter tank mounted atop the reservoir tank, the filtered oil thence passing to the third compartment. The height of the second baffle plate is less than that of the first so that, upon obstruction of the filter tank, oil from the second compartment can flow over the second plate directly into the third compartment thereby bypassing the filter tank and eliminating any shortage of oil in the line.
Inventors
- 👤 Duane Lucien Hultquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:44
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0012; B01D21/0018; B01D21/009; B01D21/10; B01D35/00; B01D35/005; B01D35/14; B01D35/18; B01D35/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
A filtering unit for filtering used oil from a device being serviced comprising a reservoir tank, at least one baffle plate for dividing said tank into at least first and second compartments, strainer means located in said first compartment for receiving oil to be filtered and for providing coarse filtering of the oil to be filtered, said first compartment being enclosed on all sides except that formed by said at least one baffle plate so that oil filtered by said strainer means flows over said baffle plate into said second compartment, heating means for heating the oil in said second compartment comprising at least one heating element extending into said second compartment, a filter tank mounted on top of said reservoir tank, first pump means mounted on top of said reservoir tank for pumping oil from said second compartment to said filter tank, and second pump means mounted on top of said reservoir tank for pumping filtered oil back to the device being serviced.
Claim 2
Dependent Claim
164 words
A filtering unit for filtering used oil from a device being serviced comprising a reservoir tank, at least one baffle plate for dividing said tank into at least first and second compartments, strainer means located in said first compartment for receiving oil to be filtered and for providing coarse filtering of the oil to be filtered, said first compartment being enclosed on all sides except that formed by said at least one baffle plate so that oil filtered by said strainer means flows over said baffle plate into said second compartment, heating means for heating the oil in said second compartment comprising at least one heating element extending into said second compartment, a filter tank mounted on top of said reservoir tank, first pump means mounted on top of said reservoir tank for pumping oil from said second compartment to said filter tank, and second pump means mounted on top of said reservoir tank for pumping filtered oil back to the device being serviced.
Claim 3
Dependent Claim
64 words
A filtering unit as claimed in claim 1 wherein said at least one baffle plate comprising first and second spaced baffle plates for dividing said reservoir tank into first, second and third compartments, said unit further comprising means for interconnecting said filter tank and said third compartment, said second pump means pumping oil from said third compartment back to the device to be serviced.
Claim 4
Dependent Claim
48 words
A filtering unit as claimed in claim 2 wherein said strainer means comprises a strainer basket mounted in spaced relationship to the bottom of said first compartment, said unit further including an inlet pipe extending through a wall of said reservoir tank and opening into said strainer basket.
Claim 5
Dependent Claim
51 words
A filtering unit as claimed in claim 3 further comprising an outlet in the bottom of said second compartment through which oil from said second compartment is pumped to said filter tank and an inlet at an upper level of said filter tank for receiving oil pumped from said second compartment.
Claim 6
Dependent Claim
98 words
A filtering unit as claimed in claim 4 wherein said filter tank includes a plurality of filtering elements therein, each element comprising a filter cartridge and a central tubular member, said filter tank further including a support plate for supporting said filtering elements and for dividing said tank into first and second chambers, said central tubular members opening into said second chamber and said means for interconnecting said filter tank and said third compartment comprising a generally vertical pipe communicating at one end thereof with said second chamber and extending through the upper surface of said reservoir tank.
Claim 7
Dependent Claim
62 words
A filtering unit as claimed in claim 5 wherein said reservoir tank is substantially square in shape and said strainer basket and said compartments are substantially rectangular in shape, said unit further comprising high- and low-level alarm means, thermostat means for controlling said heating means and pressure gauge means mounted on said filter tank for indicAting the pressure within said filter tank.
Claim 8
Dependent Claim
56 words
A filtering unit as claimed in claim 2 wherein the height of said second baffle plate is less than the height of the first baffle plate so that, upon obstruction of said filter tank, oil from said second compartment can flow over said second baffle plate into said third compartment and thus bypass said filter tank.
Claim 9
Dependent Claim
142 words
A filtering unit for filtering used oil from a device being serviced comprising a tank, first and second spaced baffle members for dividing said tank into first, second and third compartments, an inlet to said first compartment for receiving contaminated oil, oil from said first compartment flowing over said first baffle member into said second compartment, a filtering device, means for pumping oil from said second compartment into said filtering device, means for interconnecting said filtering device and said third compartment, and means for returning oil from said third compartment to the device being serviced, the height of said second baffle member being less than the height of the first baffle member so that, upon obstruction of said filtering device, oil from said second compartment can flow over said second baffle member into said third compartment and thus bypass said filtering device.
Claim 10
Dependent Claim
142 words
A filtering unit for filtering used oil from a device being serviced comprising a tank, first and second spaced baffle members for dividing said tank into first, second and third compartments, an inlet to said first compartment for receiving contaminated oil, oil from said first compartment flowing over said first baffle member into said second compartment, a filtering device, means for pumping oil from said second compartment into said filtering device, means for interconnecting said filtering device and said third compartment, and means for returning oil from said third compartment to the device being serviced, the height of said second baffle member being less than the height of the first baffle member so that, upon obstruction of said filtering device, oil from said second compartment can flow over said second baffle member into said third compartment and thus bypass said filtering device.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |