US3941571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter pleat fold spacer
Assignee: American Air Filter Co Inc
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Filing: 1975-04-07
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Granted: 1976-03-02
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Expires: 1995-04-07
Abstract
Abstract A filter pleat fold spacer for use in a gas filter device of the type having a flow-through filter frame and a pleated filter media disposed within the frame to hold the pleats of the filter media apart when subjected to the flow of gas to be filtered, the pleat spacer being formed to provide a yieldable surface adjacent the pleat fold turns of the media.
Inventors
- 👤 Allan R. Getzin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:36
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D46/10; B01D2201/00; B01D2201/12; B01D2201/127; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24298; Y10T428/24314; Y10T428/24628; Y10T428/24669; Y10T428/24686; Y10T428/24694
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A filter comprising: a pleated filter media; a plurality of pleat fold spacers inserted between the flanks of the pleated filter media to hold the pleats of the filter media apart; each spacer comprising a plurality of generally parallel reduplicating corrugations and a yieldable surface along at least one edge of said spacer disposed adjacent the pleat fold turns of the pleated filter media; said yieldable surface comprising means defining a plurality of slits at spaced intervals along and open at one end to said edge of said spacer.
Claim 2
Dependent Claim
89 words
A filter comprising: a pleated filter media; a plurality of pleat fold spacers inserted between the flanks of the pleated filter media to hold the pleats of the filter media apart; each spacer comprising a plurality of generally parallel reduplicating corrugations and a yieldable surface along at least one edge of said spacer disposed adjacent the pleat fold turns of the pleated filter media; said yieldable surface comprising means defining a plurality of slits at spaced intervals along and open at one end to said edge of said spacer.
Claim 3
Dependent Claim
15 words
The filter defined in claim 1, wherein said slits are generally parallel to each other.
Claim 4
Dependent Claim
19 words
The filter defined in claim 1, wherein said slits are generally perpendicular to said one edge of said spacer.
Claim 5
Dependent Claim
26 words
The filter defined in claim 1, wherein said yieldable surface further comprises a row of bulbous formations proximately disposed to said one edge of said spacer.
Claim 6
Dependent Claim
14 words
The filter defined in claim 4, wherein said spacer is of an openwork construction.
Claim 7
Dependent Claim
26 words
The filter defined in claim 4, wherein said reduplicating corrugations form a plurality of rows of bulbous formations extending over the entire surface of said spacer.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |