Patent US3727769A successfully refreshed from Google Patents.
US3727769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed filter media
Assignee: American Air Filter Co Inc
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Filing: 1971-04-14
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Granted: 1973-04-17
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Expires: 1991-04-14
Abstract
Abstract An improved fluid treating filter having a support frame disposed between at least two layers of filter media. The support frame is of unitary construction and bowed in a direction opposing the flow of a fluid. One layer of media is in communicative relation with the surface of the frame facing the flow of the fluid whereas the second layer is in communicative relation with the edges of the downstream surface of the frame and is in spaced relationship with the downstream surface. The filter may include a cover adaptable for outerfitting the filter wherein the cover has perforations for allowing the passage of the fluid therethrough.
Inventors
- 👤 H Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:25
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/05; Y10S55/31; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A fluid treating filter comprising: first and second sheet layers of filter media with a perforate sheet support frame disposed therebetween; said support frame being bow-shaped with an upstream and downstream surface; said first layer of filter media being bow shaped in contacting relation with the upstream surface of said support frame; and said second layer of filter media being secured to the peripheral edge of said downstream surface of said support frame and in spaced relation with the remainder of said downstream surface and means for securing said layers of filter media to said support frame at their peripheries.
Claim 2
Dependent Claim
100 words
A fluid treating filter comprising: first and second sheet layers of filter media with a perforate sheet support frame disposed therebetween; said support frame being bow-shaped with an upstream and downstream surface; said first layer of filter media being bow shaped in contacting relation with the upstream surface of said support frame; and said second layer of filter media being secured to the peripheral edge of said downstream surface of said support frame and in spaced relation with the remainder of said downstream surface and means for securing said layers of filter media to said support frame at their peripheries.
Claim 3
Dependent Claim
17 words
The filter of claim 1, said support frame being pyramid-like shaped having sides and an open base.
Claim 4
Dependent Claim
17 words
The filter of claim 1, said edges of said downstream surface forming a base of rectangular configuration.
Claim 5
Dependent Claim
12 words
The filter of claim 1 wherein said support frame is expanded metal.
Claim 6
Dependent Claim
61 words
The filter of claim 1 wherein an adhesive is added to said first layer of filter media to adhere said media to the convex side of said bow-shaped support frame and an adhesive is added to the edges of said second layer of filter media to adhere said media to the edges of the concave side of said bow-shaped support frame.
Claim 7
Dependent Claim
60 words
The filter of claim 1 including a cover adapted to outerfit and envelope said layers of filter media thereby providing said cover with a front and back wall, said cover having perforate lines extending along said front and said back walls whereby sections of said walls enclosed with said perforate lines may be easily removed when placed in operating position.
Claim 8
Dependent Claim
17 words
The filter of claim 6 wherein said cover is formed of a single sheet of flexible material.
Claim 9
Dependent Claim
16 words
The filter of claim 6 wherein said cover is formed of a single sheet of polyethylene.
Claim 10
Dependent Claim
31 words
ThE filter of claim 6 wherein said perforate lines are parallel with and a short distance inward from the outer edge of said front and back walls to define an opening.
Claim 11
Dependent Claim
12 words
The filter of claim 6 wherein said cover is a plastic bag.
Claim 12
Dependent Claim
14 words
The filter of claim 10 wherein said plastic bag is a polyethylene plastic bag.
Claim 13
Dependent Claim
19 words
The filter of claim 10 wherein said plastic bag is open at one end and sealable by heat means.
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |