US3246767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-permeable materials and process of making the same
Assignee: Pall Corp
•
Filing: 1962-08-06
•
Granted: 1966-04-19
•
Expires: 1982-08-06
Abstract
No abstract record available.
Inventors
- 👤 David B Pall
- 👤 Cyril A Keedwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:44
CPC Classifications
D; D21; D21F; D21F11/00; D21F11/02; D21F11/04; B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/50; B01D29/56; B01D29/58; B01D39/00; B01D39/14; B01D39/16; B01D39/18; B01D39/20; B01D2101/00; B01D2101/005; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A MICROPOROUS FLUID-PERMEABLE MATERIAL CAPABLE OF REMOVING ULTRAFINE PARTICLES FROM FLUIDS, COMPRISING A POROUS BASE HAVING SUPERIMPOSED THEREON AND ADHERENT THERETO A MICROPOROUS LAYER IMPREGNATING THE BASE TO AT MOST A DEPTH OF ABOUT 100 MICRONS COMPRISING A FIBROUS MATERIAL OF WHICH A PROPORTION OF FIBERS EXTEND OUTWARDLY FROM THE POROUS BASE AT AN ANGLE GREATER THAN 30*, SUFFICIENT TO IMPART TO SAID LAYER A MAXIMUM PORE DIAMETER OF LESS THAN 10 MICRONS AND A VOIDS VOLUME OF AT LEAST 75 PERCENT.
Claim 2
Dependent Claim
82 words
A MICROPOROUS FLUID-PERMEABLE MATERIAL CAPABLE OF REMOVING ULTRAFINE PARTICLES FROM FLUIDS, COMPRISING A POROUS BASE HAVING SUPERIMPOSED THEREON AND ADHERENT THERETO A MICROPOROUS LAYER IMPREGNATING THE BASE TO AT MOST A DEPTH OF ABOUT 100 MICRONS COMPRISING A FIBROUS MATERIAL OF WHICH A PROPORTION OF FIBERS EXTEND OUTWARDLY FROM THE POROUS BASE AT AN ANGLE GREATER THAN 30*, SUFFICIENT TO IMPART TO SAID LAYER A MAXIMUM PORE DIAMETER OF LESS THAN 10 MICRONS AND A VOIDS VOLUME OF AT LEAST 75 PERCENT.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |