US3557958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-drainback valve means for oil filters
Assignee: Individual
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Filing: 1968-09-27
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Granted: 1971-01-26
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Expires: 1988-09-27
Abstract
Abstract Antidrainback valve means for automotive engine mounted oil filters comprising a valve element in the form of an annulus of flexible rubberlike material secured along its inner edge to the inner face of the filter shell base plate and extending radially outwardly therefrom in normal covering relation to the oil inlet openings provided in said base plate and having outer edge diameter slightly greater than that of a circular line form seat provided therefor on the inner face of the base plate, and annular spring means interposed and reactive between the filter element within the filter shell and said outer peripheral portion of said valve annulus normally to maintain said peripheral portion seated on said line form seat.
Inventors
- 👤 Jesse A Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:41
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/08; B01D27/10; B01D27/106
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
221 words
In an oil filter of the type wherein a filter element is enclosed within an open bottom can body closed by a rigid base plate and supported on a centrally disposed adapter bushing in turn supported on said base plate, and wherein said base plate is provided with a central oil outlet opening and a series of circumferentially spaced oil inlet openings disposed on a circle of diameter greater than that of said central opening, antidrainback valve means comprising: means on the relatively inner face of said base plate providing a line form seat extending along a circle having diameter greater than that of the circle on which said oil inlet openings are disposed; a valve annulus of flexible rubberlike material disposed generally flush against the inner face of said base plate and in normal covering relation as respects said oil inlet openings and further having outer edge diameter slightly greater than that of said circular line form seat whereby its outer peripheral portion overlies said seat; an integral radially outwardly extending flange on the upper end portion of said adapter bushing on which said filter element is directly supported; and spring means reactive between the under face of said flange and the outer peripheral portion of said annulus and operating normally to maintain same seated on said line form seat.
Claim 2
Dependent Claim
221 words
In an oil filter of the type wherein a filter element is enclosed within an open bottom can body closed by a rigid base plate and supported on a centrally disposed adapter bushing in turn supported on said base plate, and wherein said base plate is provided with a central oil outlet opening and a series of circumferentially spaced oil inlet openings disposed on a circle of diameter greater than that of said central opening, antidrainback valve means comprising: means on the relatively inner face of said base plate providing a line form seat extending along a circle having diameter greater than that of the circle on which said oil inlet openings are disposed; a valve annulus of flexible rubberlike material disposed generally flush against the inner face of said base plate and in normal covering relation as respects said oil inlet openings and further having outer edge diameter slightly greater than that of said circular line form seat whereby its outer peripheral portion overlies said seat; an integral radially outwardly extending flange on the upper end portion of said adapter bushing on which said filter element is directly supported; and spring means reactive between the under face of said flange and the outer peripheral portion of said annulus and operating normally to maintain same seated on said line form seat.
Claim 3
Dependent Claim
29 words
Antidrainback valve means according to claim 1, wherein said line form seat comprises the crest line of a circular, relatively inwardly directed, integral ridge provided in said base plate.
Claim 4
Dependent Claim
108 words
Antidrainback valve means according to claim 1, wherein said spring means comprises a flat annulus of spring metal having outer edge diameter slightly greater than the circle of said line form seat and being disposed in encircling relation about said adapter bushing and having upwardly inclined, circumferentially extending spring fingers struck out from its inner edge portion and which bear against the under face of said adapter-bushing flange, said spring fingers being in compression thereby causing the peripheral portion of said flat annulus to bear with spring pressure against the outer peripheral portion of the valve annulus and thereby normally maintain same seated on said line form seat.
Claim 5
Dependent Claim
30 words
Antidrainback valve means according to clam claim 3, wherein said line form seat comprises the crest line of a circular, relatively inwardly directed, integral ridge provided in said base plate.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |