Patent US3724671A successfully refreshed from Google Patents.
US3724671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid treating filter
Assignee: Allis Chalmers Corp
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Filing: 1971-02-04
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Granted: 1973-04-03
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Expires: 1991-02-04
Abstract
Abstract An improved fluid treating filter having two support frames adaptable for mating relationship with a filter media disposed therebetween. Each of the support frames has a retaining screen with side means projecting at right angles therefrom, said side means being provided with snap means which are adaptable for holding the support frames in said mating relationship.
Inventors
- 👤 J Tate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:40
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D46/00; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A fluid treating filter comprising: a first filter frame member of expanded metal including a retaining screen with side wall means projecting at right angles therefrom and extending substantially around the outer periphery of said retaining screen; a second filter frame member having a retaining screen with side wall means projecting at right angles therefrom and extending substantially around the outer periphery of said retaining screen, said side wall means of said second filter frame member having snap lugs engaging with said side wall means of said first filter frame member whereby said retaining screen of said second frame member is in face to face relationship and spaced from said retaining screen of said first frame member; and filter media disposed between said first and second filter frame members.
Claim 2
Dependent Claim
129 words
A fluid treating filter comprising: a first filter frame member of expanded metal including a retaining screen with side wall means projecting at right angles therefrom and extending substantially around the outer periphery of said retaining screen; a second filter frame member having a retaining screen with side wall means projecting at right angles therefrom and extending substantially around the outer periphery of said retaining screen, said side wall means of said second filter frame member having snap lugs engaging with said side wall means of said first filter frame member whereby said retaining screen of said second frame member is in face to face relationship and spaced from said retaining screen of said first frame member; and filter media disposed between said first and second filter frame members.
Claim 3
Dependent Claim
48 words
The filter of claim 1, said retaining screens of said first and said second filter frame members being of rectangular shape and of approximately the same size, and said side means of said first and said second filter frame member including four side members for each side means.
Claim 4
Dependent Claim
19 words
The filter of claim 1, said snap lugs being punched from said side means of said second filter frame.
Claim 5
Dependent Claim
14 words
The filter of claim 1, said snap lugs being inwardly and upwardly extending tongues.
Claim 6
Dependent Claim
14 words
The filter of claim 1, said snap lugs being inwardly and downwardly extending tongues.
Claim 7
Dependent Claim
13 words
The filter of claim 1 wherein said filter media is a fibrous material.
Claim 8
Dependent Claim
11 words
The filter of claim 6 wherein said fibrous material is fiberglas.
Claim 9
Dependent Claim
31 words
The filter of claim 1, said second filter frame member being plastic, and said side wall means of said plastic outerfitting said side wall means of said first filter frame member.
Claim 10
Dependent Claim
28 words
The filter of claim 8, said snap lugs of said side means of said second filter frame being adapted to engage with strands of first filter frame member.
Claim 11
Dependent Claim
20 words
The filter of claim 9, said snap lugs engaging said strands of expanded metal at the apex of said strands.
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US3252580A
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Cited
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |