Patent US3668843A successfully refreshed from Google Patents.
US3668843A
Expired / Lapsed
US
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Filter support construction
Assignee: American Air Filter Co Inc
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Filing: 1970-04-06
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Granted: 1972-06-13
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Expires: 1990-04-06
Abstract
Abstract Gas filter apparatus including a flow-through filter support frame having opposed channels to receive a filter cell header frame and means cooperating with opposed sides of the filter cell header frame to resiliently urge the header frame into sealing engagement in the support channels.
Inventors
- 👤 Karl L Westlin
- 👤 Allan R Getzin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:36
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D51/00; B01D51/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
Gas filter apparatus comprising: a flow-through support frame defining a gas passageway; spaced opposed channel members of Ushaped cross-section mounted to said support frame and extending transversely across said gas passageway, said channel members being opened at one end; a filter cell including a rectangular flow-through header frame slidably received between said channel members through said open end with a filter media member having its peripheral edges fastened to said header frame, said header frame being so sized that opposed sides thereof slidably engage in said opposed channel members of said support frame; and longitudinally extending spring members attached to and cooperating with said opposed sides of said header frame to uniformly and constantly urge each of said opposed sides of the header frame toward sealing engagement against the corresponding inner wall of said opposed channel members of said support framE to seal the peripheral edges of the filter media member about the opening of the support frame.
Claim 2
Dependent Claim
158 words
Gas filter apparatus comprising: a flow-through support frame defining a gas passageway; spaced opposed channel members of Ushaped cross-section mounted to said support frame and extending transversely across said gas passageway, said channel members being opened at one end; a filter cell including a rectangular flow-through header frame slidably received between said channel members through said open end with a filter media member having its peripheral edges fastened to said header frame, said header frame being so sized that opposed sides thereof slidably engage in said opposed channel members of said support frame; and longitudinally extending spring members attached to and cooperating with said opposed sides of said header frame to uniformly and constantly urge each of said opposed sides of the header frame toward sealing engagement against the corresponding inner wall of said opposed channel members of said support framE to seal the peripheral edges of the filter media member about the opening of the support frame.
Claim 3
Dependent Claim
106 words
The apparatus of claim 1, said spring members comprising spaced, opposed flexible U-shaped rod members, each including a base leg and parallel side legs with said base leg being coextensive with and fastened to a side of said header frame intermediate the sides which slidably engage in said channel members of said support frame, said side legs being coextensive with said channel engaging sides of said header frame, each side leg including a floating end portion bent at an angle to resiliently engage against one inner wall of said channel member to urge said header frame side toward the opposite inner wall of said channel member.
Claim 4
Dependent Claim
40 words
The apparatus of claim 1, said filter media member having its peripheral edges overlapping that face of said header frame urged toward sealing engagement against said inner walls of said channel members to serve as an intermediate sealing member therebetween.
References Cited (Backward Citations)
US487656A
Cited
US3247652A
Cited
US3309848A
Cited
US3418794A
Cited
US3394534A
Cited
US3500618A
Cited
US3541767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |