US3592767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated filter sheets and filter elements and process for making the same
Assignee: Pall Corp
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Filing: 1970-04-23
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Granted: 1971-07-13
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Expires: 1990-04-23
Abstract
Abstract LAMINATED FILTER ENDS SHEETS, A PROCESS FOR MAKING THEM AND FILTER ELEMENTS MADE OF SUCH LAMINATED FILTER SHEETS ARE PROVIDED. A COMPOSITE OF A MICROPOROUS FILTERING PLY, AND A REINFORCING PLY COMPRISING A THIN POROUS SHEET COMPOSED AT LEAST IN PART OF POTENTIALLY ADHESIVE ADHESIVE FABRIC IS SUBJECTED TO PRESSURE UNDER CONDITIONS POTENTIATING THE ADHESIVE OF THE REINFORCING PLY TO EFFECT A BOND BETWEEN THE FABRIC AND THE SURFACE OF THE FILTERING PLY IN CONTACT THEREWITH WITHOUT SUBSTANTIALLY DECREASING THE POROSITY OF THE FILTERING PLY. THE RESULTING FILTER SHEET OR ELEMENT CAN BE FITTED WITH END CAPS FOR SUPPORTING THE FILTER SHEET IN A HOUSING FOR THE FILTRATION OF FLUID.
Inventors
- 👤 David B Pall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:07
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/50; B01D29/56; B01D29/58; B01D39/08; B01D39/083; B01D39/086; B01D2201/00; B01D2201/18; B01D2201/188; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0654; B01D2239/0668; B01D2239/0681; B01D2239/12; B01D2239/1216
Claims Analysis
Total Claims: 0
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |