US4915852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil filter assembly for a Volkswagen flat four opposed cylinder air cooled engine
Assignee: Individual
•
Filing: 1989-04-12
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Granted: 1990-04-10
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Expires: 2009-04-12
Abstract
Abstract An oil filter assembly for a Volkswagen flat four opposed cylinder air cooled engine including an external oil sump secured to the oil drain hole of the engine oil pan and containing an open-sided inflow canister-type oil filter disposed therein. The oil filter assembly includes an open sided inflow canister type oil filter disposed in the external oil sump, a seal for sealing the top of the oil filter to the engine oil pick up tube, a bypass valve disposed in the bottom of the oil filter, spring means bearing against the bypass valve so as to urge the bypass valve and oil filter towards the engine oil pick up tube, and a cover plate forming the bottom of the external oil sump and bearing against the spring means.
Inventors
- 👤 Robert A. Tomlinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:27
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D35/027; B01D29/00; B01D29/11; B01D29/114; B01D35/14; B01D35/147; F; F01; F01M; F01M11/00; F01M11/0004; F01M2011/0079; Y; Y10; Y10S; Y10S210/00; Y10S210/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
The method of providing an oil filter assembly for a Volkswagen flat four opposed cylinder air cooled engine comprising providing an additional oil sump secured to an engine oil pan drain hole cover plate opening, installing an open-sided inflow canister-type oil filter in said additional sump, said oil filter having an oil seal at the upper end thereof for engaging an engine oil pump pickup tube in sealed relation, and a bypass valve at the lower end thereof, and compressing spring means against said bypass valve for urging said bypass valve and said oil filter upward in said sump toward said engine oil pump pickup tube.
Claim 2
Independent Claim
106 words
The method of providing an oil filter assembly for a Volkswagen flat four opposed cylinder air cooled engine comprising providing an additional oil sump secured to an engine oil pan drain hole cover plate opening, installing an open-sided inflow canister-type oil filter in said additional sump, said oil filter having an oil seal at the upper end thereof for engaging an engine oil pump pickup tube in sealed relation, and a bypass valve at the lower end thereof, and compressing spring means against said bypass valve for urging said bypass valve and said oil filter upward in said sump toward said engine oil pump pickup tube.
Claim 3
Dependent Claim
112 words
An oil filter assembly for a Volkswagen flat four opposed cylinder air cooled engine comprising an external oil sump for said engine secured to a oil drain hole of an engine oil pan, an open-sided inflow canister-type oil filter disposed in said oil sump, an oil seal for sealing an engine oil pump pickup tube to the top of said oil filter, a bypass valve disposed in the bottom of said oil filter, spring means bearing against said bypass valve and urging said bypass valve and said oil filter upwards toward said oil pump pickup tube, and a cover plate forming the bottom of said sump and bearing against said spring means.
Claim 4
Dependent Claim
112 words
An oil filter assembly for a Volkswagen flat four opposed cylinder air cooled engine comprising an external oil sump for said engine secured to a oil drain hole of an engine oil pan, an open-sided inflow canister-type oil filter disposed in said oil sump, an oil seal for sealing an engine oil pump pickup tube to the top of said oil filter, a bypass valve disposed in the bottom of said oil filter, spring means bearing against said bypass valve and urging said bypass valve and said oil filter upwards toward said oil pump pickup tube, and a cover plate forming the bottom of said sump and bearing against said spring means.
Claim 5
Dependent Claim
72 words
The oil filter assembly of claim 2 wherein said oil sump comprises a relatively flat and thin oil reservoir which secures to the oil drain hole of the engine oil pan, and an oil drain hole in the bottom of said external oil sump large enough to allow the oil filter to pass therethrough and said cover plate is a relatively flat plate and seals the oil drain hole of said sump.
Claim 6
Dependent Claim
41 words
The oil filter assembly of claim 2, wherein said sump is generally cylindrical in configuration and closely encloses said oil filter and secures to the oil drain hole of the engine oil pan, said cover plate being integral to said sump.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |