US3774377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter assembly with replaceable filter element
Assignee: American Air Filter Co Inc
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Filing: 1972-04-21
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Granted: 1973-11-27
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Expires: 1992-04-21
Abstract
Abstract An improved fluid filter assembly with a replaceable filter element having a frame, channel shaped in cross-section defining a shallow box with an upstream and downstream opening therein to permit fluid flow therethrough and a foraminous filter supporting member adjacent to one of the openings; a fibrous filter mat covering the foraminous member and having marginal portions extending into the channel shaped frame; and, a resilient endless retainer removably engaging the fibrous filter mat by nesting in the channel shaped frame, the resilient endless retainer being an endless loop pivotally attached to the exterior of one extremity of the channel shaped frame, the loop including an inwardly extending groove portion at a position opposite the portion of the loop which is pivotally attached to the channel shaped frame, the inwardly engaging portion being adapted for removable engagement with the interior of the channel shaped frame.
Inventors
- 👤 G Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:12
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A fluid treating filter assembly comprising: an inwardly extending channel-shaped in cross-section flow-through frame having opposed upstream and downstream openings therein providing spaced opposed marginal top and bottom flanges and defining a peripheral channel; a foraminous plate extending across at least one of said openings of said frame and supported on the adjacent flange thereof; a sheet of filter medium supported on said plate and having its marginal portions extending into said channel of said frame; and, a resilient endless spring retainer means pivotally attached to the flange along the other opening of said frame removably engaging said filter medium in said peripheral channel, said resilient endless retainer means being an endless loop having an inwardly extending groove portion opposite of and in alignment with the portion of said loop pivotally attached to said frame, said retainer means being so constructed that movement of said groove inwardly of said loop disengages said retainer from said frame.
Claim 2
Dependent Claim
156 words
A fluid treating filter assembly comprising: an inwardly extending channel-shaped in cross-section flow-through frame having opposed upstream and downstream openings therein providing spaced opposed marginal top and bottom flanges and defining a peripheral channel; a foraminous plate extending across at least one of said openings of said frame and supported on the adjacent flange thereof; a sheet of filter medium supported on said plate and having its marginal portions extending into said channel of said frame; and, a resilient endless spring retainer means pivotally attached to the flange along the other opening of said frame removably engaging said filter medium in said peripheral channel, said resilient endless retainer means being an endless loop having an inwardly extending groove portion opposite of and in alignment with the portion of said loop pivotally attached to said frame, said retainer means being so constructed that movement of said groove inwardly of said loop disengages said retainer from said frame.
Claim 3
Dependent Claim
15 words
The fluid treating filter of claim 1, said foraminous plate extending across said downstream opening.
Claim 4
Dependent Claim
18 words
The air filter assembly of claim 1, said sheet of filter medium being a nonwoven spun fiberglas material.
Claim 5
Dependent Claim
15 words
The fluid treating filter of claim 1, said flow-through frame being of generally rectangular configuration.
Claim 6
Dependent Claim
35 words
The air filter assembly of claim 4, said open sided frame of generally rectangular configuration includes two channel shaped side members substantially U-shaped in cross-section and two channel shaped end members substantially U-shaped in cross-section.
Claim 7
Dependent Claim
30 words
The air filter assembly of claim 5, said resilient endless retainer being pivotally attached to one channel shaped side member and adaptable for removable engagement with an opposite side member.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |