Patent US3238056A successfully refreshed from Google Patents.
US3238056A
Expired / Lapsed
US
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Microporous materials and process of making the same
Assignee: Pall Corp
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Filing: 1961-03-27
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Granted: 1966-03-01
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Expires: 1981-03-27
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 12:16
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/14; B01D69/141; B01D69/1411; B01D39/00; B01D39/14; B01D39/20; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/68; D21H21/00; D21H21/14; D21H21/22; Y; Y10; Y10S; Y10S55/00; Y10S55/05; Y10S55/13; Y10T; Y10T428/00; Y10T428/26; Y10T428/268
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR PREPARING MICROPOROUS MATERIAL HAVING ULTRAFINE PORES WHICH COMPRISES FORMING A SUSPENSION COMPRISING PARTICULATE MATERIAL SUFFICIENTLY SMALL TO ENTER PORES IN A SUBSTRATE GREATER THAN 25 MICRONS UP TO ABOUT 150 MICRONS IN DIAMETER COMPOSED OF AT LEAST 5% FIBROUS MATERIAL SUSPENDED IN A FLUID, BRINGING THE SUSPENSION INTO CONTACT WITH A SUBSTRATE HAVING A PROPORTION OF PORES GREATER THAN 25 MICRONS UP TO ABOUT 150 MICRONS IN DIAMETER, FLOWING THE SUSPENSION INTO AND THROUGH THE SUBSTRATE, DEPOSITING THE PARTICULATE MATERIAL THEREWITH IN AN AMOUNT TO REDUCE THE PORE DIAMETER TO LESS THAN 25 MICRONS, AND DISCONTINUING THE FLOW OF THE SUSPENSION THROUGH THE SUBSTRATE WHILE THE SUBSTRATE REMAINS MICROPOROUS.
Claim 2
Dependent Claim
112 words
A PROCESS FOR PREPARING MICROPOROUS MATERIAL HAVING ULTRAFINE PORES WHICH COMPRISES FORMING A SUSPENSION COMPRISING PARTICULATE MATERIAL SUFFICIENTLY SMALL TO ENTER PORES IN A SUBSTRATE GREATER THAN 25 MICRONS UP TO ABOUT 150 MICRONS IN DIAMETER COMPOSED OF AT LEAST 5% FIBROUS MATERIAL SUSPENDED IN A FLUID, BRINGING THE SUSPENSION INTO CONTACT WITH A SUBSTRATE HAVING A PROPORTION OF PORES GREATER THAN 25 MICRONS UP TO ABOUT 150 MICRONS IN DIAMETER, FLOWING THE SUSPENSION INTO AND THROUGH THE SUBSTRATE, DEPOSITING THE PARTICULATE MATERIAL THEREWITH IN AN AMOUNT TO REDUCE THE PORE DIAMETER TO LESS THAN 25 MICRONS, AND DISCONTINUING THE FLOW OF THE SUSPENSION THROUGH THE SUBSTRATE WHILE THE SUBSTRATE REMAINS MICROPOROUS.
References Cited (Backward Citations)
US1396834A
Cited
US1857498A
Cited
US2372437A
Cited
US2517753A
Cited
US2746608A
Cited
US2971907A
Cited
US3039914A
Cited
US3053762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |