Patent EP0661073A1 successfully refreshed from Google Patents.
US4608173A
Expired / Lapsed
US
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Filter
Assignee: Tonen General Sekiyu KK
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Filing: 1985-06-07
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Granted: 1986-08-26
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Expires: 2005-06-07
Abstract
Abstract A filter of a nonwoven fabric capable of removing particles from a fluid has attached to the fibers of said fabric a polymeric substance having a functional group capable of adsorbing said particles. In a preferred embodiment the filter is used to remove carbonaceous particles from a hydrocarbon liquid.
Inventors
- 👤 Koh Watanabe
- 👤 Michihide Tokashiki
- 👤 Sadao Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28033; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01J20/28002; B01J20/28004; B01J20/28011; B01J20/28028; C; C10; C10G; C10G25/00; C10G25/003; C10G31/00; C10G31/09; B01D2239/00; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/12; B01D2239/1233; B01D2239/1291
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A filter for removing carbonaceous particles from oil, gas, or air which comprises a fabric composed of (a) a plurality of nonwoven fibers having a composition selected from the group consisting of polymers and cotton, and having a diameter between about 0.5 and 10 micrometers, and being randomly entangled to provide a filter media, and (b) a cationic polyacrylamide coating on said fibers for adsorbing and filtering said particles in said oil, gas, or air.
Claim 2
Dependent Claim
75 words
A filter for removing carbonaceous particles from oil, gas, or air which comprises a fabric composed of (a) a plurality of nonwoven fibers having a composition selected from the group consisting of polymers and cotton, and having a diameter between about 0.5 and 10 micrometers, and being randomly entangled to provide a filter media, and (b) a cationic polyacrylamide coating on said fibers for adsorbing and filtering said particles in said oil, gas, or air.
Claim 3
Dependent Claim
48 words
The filter as defined in claim 1 wherein the fabric is made by extruding a molten resin from a die having a plurality of fine openings and blowing the molten fibers with an air stream sufficient to stretch the fibers, and collecting the fibers to form the fabric.
Claim 4
Dependent Claim
16 words
The filter as defined in claim 2 wherein the resin is a polyolefin, polyamide, or polyester.
Claim 5
Dependent Claim
33 words
The filter as defined in claim 2 wherein the nonwoven fibers are composed of polypropylene and wherein the filter media has a bulk density between about 0.15 and 0.40 grams per cubic centimeter.
Claim 6
Dependent Claim
35 words
The filter as defined in claim 4 wherein the cationic polyacrylamide is attached to the fibers as a aqueous solution containing from about 0.1 to 20 wt% of the functional polymeric substance, followed by drying.
Claim 7
Dependent Claim
34 words
The filter as defined in claim 2 wherein the fabric is composed of a polyolefin or nylon fibers and the cationic polyacrylamide is attached to the fibers as an aqueous solution followed by drying.
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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |