US3828934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Media for wound filter elements
Assignee: Parker Hannifin Corp
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Filing: 1973-10-09
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Granted: 1974-08-13
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Expires: 1993-10-09
Abstract
Abstract Filter cartridges formed by winding yarn or roving in a honeycomb pattern around a center core are made with improved porosity control and filtration capacity by using a substrate to which fibers are attached or flocked before winding. Substrates of varying diameter and composition may be used and may have fibers of varying length, diameter and composition attached, depending on the porosity and filtration rate desired in the finished cartridge.
Inventors
- 👤 J Green
- 👤 J Luttrell
- 👤 J Schmitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:44
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D39/16; B01D39/1607; B01D39/2068; B01D39/2082; B01D2239/00; B01D2239/06; B01D2239/069; B01D2239/0695; B01D2239/12; B01D2239/1233; B01D2239/1291
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A mechanically self-sustaining porous tubular filter element constructed from a substrate having a plurality of fibers having ends thereof attached to said substrate, the substrate with attached fibers being wound back and forth in spaced criss-cross fashion into a tubular cartridge; said substrate having a diameter ranging from about 0.01 to about 0.25 inches and said fibers having diameters ranging from about 10 to about 90 microns and fiber lengths ranging from about 0.03 to 1 inch.
Claim 2
Dependent Claim
77 words
A mechanically self-sustaining porous tubular filter element constructed from a substrate having a plurality of fibers having ends thereof attached to said substrate, the substrate with attached fibers being wound back and forth in spaced criss-cross fashion into a tubular cartridge; said substrate having a diameter ranging from about 0.01 to about 0.25 inches and said fibers having diameters ranging from about 10 to about 90 microns and fiber lengths ranging from about 0.03 to 1 inch.
Claim 3
Dependent Claim
27 words
A filter element according to claim 1 in which said substrate has a plurality of fibers, each fiber having one end thereof directly attached to said substrate.
Claim 4
Dependent Claim
27 words
A filter element according to claim 1 in which the substrate comprises fibers selected from the group consisting of cotton, wool, nylon, rayon, polyester and acrylic fibers.
Claim 5
Dependent Claim
24 words
A filter element according to claim 1 in which the substrate comprises fibers selected from the group consisting of asbestos, glass and aluminum silicate.
Claim 6
Dependent Claim
22 words
A filter element according to claim 1 in which the substrate comprises materials from the group consisting of copper and stainless steel.
Claim 7
Dependent Claim
27 words
A filter element according to claim 1 in which the overall diameter of the substrate with attached fibers ranges from about 0.15 inch to about 2 inches.
Claim 8
Dependent Claim
31 words
A filter element according to claim 6 in which the fibers attached to the substrate comprise fibers selected from the group consisting of cotton, wool, nylon, rayon, polyester and acrylic fibers.
Claim 9
Dependent Claim
28 words
A filter element according to claim 6 in which the fibers attached to the substrate comprise fibers selected from the group consisting of asbestos, glass and aluminum silicate.
Claim 10
Dependent Claim
27 words
A filter element according to claim 6 in which the fibers attached to the substrate comprise fibers selected from the group consisting of copper and stainless steel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |