US3682308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine coolant filter
Assignee: Volvo White Truck Corp
•
Filing: 1970-12-03
•
Granted: 1972-08-08
•
Expires: 1990-12-03
Abstract
Abstract A filter for engine coolant in an engine cooling system comprises a filter base connected to a coolant conduit and a filter body which is detachable from the base for replacement. Check valves are carried in the base filter inlet and outlet passageways so that the filter is replaced without coolant losses. A pressure differential is created across the filter assembly so that part of the coolant flowing through the conduit is forced through the filter. In one embodiment, the filter includes a ram tube and an ejector tube for creating the pressure differential. In another embodiment, a flow restricting orifice is provided in the conduit between the filter inlet and outlet passageways.
Inventors
- 👤 Charles L Moon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:34
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/153; B01D29/00; B01D29/88; B01D29/90; B01D29/902; B01D29/92; B01D29/925
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
A filter connected to a coolant conduit in an internal combustion engine cooling system comprising: a. a filter base fixed to said conduit; b. a filter body detachably supported on said filter base; c. a first passageway communicating said conduit with said filter body through said filter base; d. a second passageway communicating said filter body with said conduit through said filter base; e. means associated with said filter base for creating a pressure differential across said filter body through said passageways to force coolant flowing in said conduit through said filter body; and, f. valve means in said filter base for blocking said passageways when said filter body is removed from said filter base.
Claim 2
Dependent Claim
115 words
A filter connected to a coolant conduit in an internal combustion engine cooling system comprising: a. a filter base fixed to said conduit; b. a filter body detachably supported on said filter base; c. a first passageway communicating said conduit with said filter body through said filter base; d. a second passageway communicating said filter body with said conduit through said filter base; e. means associated with said filter base for creating a pressure differential across said filter body through said passageways to force coolant flowing in said conduit through said filter body; and, f. valve means in said filter base for blocking said passageways when said filter body is removed from said filter base.
Claim 3
Dependent Claim
47 words
A filter as claimed in claim 1 wherein said means for creating a pressure differential comprises a ram tube defining part of said first passageway, said ram tube projecting from said base into said conduit and opening towards the direction of flow of coolant in said conduit.
Claim 4
Dependent Claim
24 words
A filter as claimed in claim 2 wherein said ram tube opening is spaced substantially away from the conduit wall and said filter base.
Claim 5
Dependent Claim
46 words
A filter as claimed in claim 2 wherein said means for creating a pressure differential further comprises an ejector tube forming part of said second passageway and projecting into said conduit from said filter base, said ejector tube defining an opening facing downstream in said conduit.
Claim 6
Dependent Claim
40 words
A filter as claimed in claim 4 wherein said valve means comprises first and second valves in said first and second passageways respectively, said valves blocking flow through said passageways in the absence of a pressure differential across said passageways.
Claim 7
Dependent Claim
37 words
A filter as claimed in claim 4 wherein said valve means comprises at least one valve member in one of said passageways for blocking flow through said passageway in the absence of cooling flow in said conduit.
Claim 8
Dependent Claim
29 words
A filter as claimed in claim 1 wherein said valve means comprises at least one valve for blocking a passageway when said filter body is removed from said base.
Claim 9
Dependent Claim
28 words
A filter as claimed in claim 1 wherein said means for creating a pressure differential comprises an orifice defining member extending into said conduit from said filter base.
Claim 10
Dependent Claim
44 words
A filter as claimed in claim 1 wherein said filter body is threaded to said filter base and further including seal means between said filter body and said filter base for preventing leakage of coolant passing between said filter body and said filter base.
Claim 11
Dependent Claim
15 words
A filter as claimed in claim 9 wherein said filter body is a discardable unit.
Claim 12
Dependent Claim
130 words
An internal combustion engine cooling system including liquid coolant circulating conduits and a coolant treatment system comprising: a. a filter base integral with a conduit of said cooling system; b. a filter body detachably connected to said base and extending therefrom exteriorly of said conduit; c. a filter inlet passage extending through said base between said conduit and said filter body; d. a filter outlet passage extending through said base from said filter body to said conduit; e. valve means for closing said passageways to prevent coolant loss from said system when said filter is removed from said base; and, f. means in said conduit between said filter inlet passage and said filter outlet passage for producing a coolant pressure differential whereby coolant tends to flow through said filter body.
Claim 13
Dependent Claim
130 words
An internal combustion engine cooling system including liquid coolant circulating conduits and a coolant treatment system comprising: a. a filter base integral with a conduit of said cooling system; b. a filter body detachably connected to said base and extending therefrom exteriorly of said conduit; c. a filter inlet passage extending through said base between said conduit and said filter body; d. a filter outlet passage extending through said base from said filter body to said conduit; e. valve means for closing said passageways to prevent coolant loss from said system when said filter is removed from said base; and, f. means in said conduit between said filter inlet passage and said filter outlet passage for producing a coolant pressure differential whereby coolant tends to flow through said filter body.
Claim 14
Dependent Claim
60 words
A system as claimed in claim 11 wherein said valve means comprises at least one normally closed valve in one of said passages, said valve having a part engaged by said filter body and maintained open when said filter body is attached to said filter base, said valve closing said passage when said filter body is removed from said base.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |