US3591010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter having a microporous layer attached thereto
Assignee: Pall Corp
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Filing: 1968-06-10
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Granted: 1971-07-06
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Expires: 1988-06-10
Abstract
Abstract A corrugated filter element having a microporous layer deposited on a substrate sheet provided with portions of reduced porosity at the areas of the base folds of the corrugations.
Inventors
- 👤 David B Pall
- 👤 Cyril A Keedwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:30
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
A corrugated microporous filter element having a maximum pore diameter of 25 microns, comprising a porous substrate sheet formed in corrugation folds having bases with a radius of curvature of at least 0.025 inch and of a porosity at least 10 percent less than the porosity of all remaining areas of the sheet, and a microporous layer laid down on said sheet by fluid deposition after corrugation.
Claim 2
Dependent Claim
67 words
A corrugated microporous filter element having a maximum pore diameter of 25 microns, comprising a porous substrate sheet formed in corrugation folds having bases with a radius of curvature of at least 0.025 inch and of a porosity at least 10 percent less than the porosity of all remaining areas of the sheet, and a microporous layer laid down on said sheet by fluid deposition after corrugation.
Claim 3
Dependent Claim
20 words
A corrugated microporous filter element in accordance with claim 1 wherein the microporous layer is coated on the substrate sheet.
Claim 4
Dependent Claim
23 words
A corrugated microporous filter element in accordance with claim 2 wherein the microporous layer is supported within the pores of the substrate sheet.
Claim 5
Dependent Claim
26 words
A corrugated microporous filter element in accordance with claim 2 wherein the microporous layer is coated on and supported within the pores of the substrate sheet.
Claim 6
Dependent Claim
24 words
A corrugated microporous filter element in accordance with claim 2 wherein the microporous layer is adhered to the substrate sheet by a bonding agent.
Claim 7
Dependent Claim
21 words
A corrugated microporous filter element in accordance with claim 5 wherein the microporous layer is in admixture with a particulate material.
Claim 8
Dependent Claim
23 words
A corrugated microporous filter element in accordance with claim 2 wherein the microporous layer comprises at least 25 percent fibrous material by weight.
Claim 9
Dependent Claim
17 words
A corrugated microporous filter element in accordance with claim 1 wherein the substrate sheet is a paper.
Claim 10
Dependent Claim
18 words
A corrugated microporous filter element in accordance with claim 1 wherein the substrate sheet is a wire mesh.
Claim 11
Dependent Claim
18 words
A corrugated microporous filter element in accordance with claim 1 wherein said microporous layer comprises a bactericidal agent.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |