US3353682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-permeable fibrous multilayer materials and process of making the same
Assignee: Pall Corp
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Filing: 1966-02-28
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Granted: 1967-11-21
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Expires: 1986-02-28
Abstract
No abstract record available.
Inventors
- 👤 David B Pall
- 👤 Cyril A Keedwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:33
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2082; B01D39/2089; B01D39/16; B01D39/1607; B01D39/18; B01D39/2003; B01D39/2017; B01D39/2024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR PREPARING MICROPOROUS INTEGRATED MULTILAYER FLUID-PERMEABLE MATERIAL FROM A SINGLE DISPERSION OF FIBROUS MATERIAL IN A DISPERSING LIQUID, WHICH COMPRISES FLOWING UPON A FORAMINOUS SUPPORT A DISPERSION IN A DISPERSING LIQUID OF FIBROUS MATERIAL COMPRISING AT LEAST 25% FIBROUS MATERIAL, FORMING A PLURALITY OF A FLOCCULATED CLUMPED MASSES OF DEFLOCCULATED FIBERS TOGETHER WITH A PROPORTION OF SEPARATE FIBERS IN THE DISPERSION, FORMING ON THE FORAMINOUS SUPPORT A THIN FIRST MICROPOROUS LAYER HAVING FIBERS LYING ALMOST ENTIRELY IN PLANES APPROXIMATELY PARALLEL TO THE PLANE OF THE LAYER, AND HAVING A MAXIMUM PORE DIAMETER OF LESS THAN 25 MICRONS, BY FLOW THROUGH THE SUPPORT OF NOT OVER 20% OF THE DISPERSING LIQUID AT A PRESSURE DIFFERTIAL OF LESS THAN 12 INCHES OF WATER, DE-
Claim 2
Dependent Claim
124 words
A PROCESS FOR PREPARING MICROPOROUS INTEGRATED MULTILAYER FLUID-PERMEABLE MATERIAL FROM A SINGLE DISPERSION OF FIBROUS MATERIAL IN A DISPERSING LIQUID, WHICH COMPRISES FLOWING UPON A FORAMINOUS SUPPORT A DISPERSION IN A DISPERSING LIQUID OF FIBROUS MATERIAL COMPRISING AT LEAST 25% FIBROUS MATERIAL, FORMING A PLURALITY OF A FLOCCULATED CLUMPED MASSES OF DEFLOCCULATED FIBERS TOGETHER WITH A PROPORTION OF SEPARATE FIBERS IN THE DISPERSION, FORMING ON THE FORAMINOUS SUPPORT A THIN FIRST MICROPOROUS LAYER HAVING FIBERS LYING ALMOST ENTIRELY IN PLANES APPROXIMATELY PARALLEL TO THE PLANE OF THE LAYER, AND HAVING A MAXIMUM PORE DIAMETER OF LESS THAN 25 MICRONS, BY FLOW THROUGH THE SUPPORT OF NOT OVER 20% OF THE DISPERSING LIQUID AT A PRESSURE DIFFERTIAL OF LESS THAN 12 INCHES OF WATER, DE-
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |