US4623560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making water removing filter media
Assignee: Central Illinois Manufacturing Co
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Filing: 1984-08-20
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Granted: 1986-11-18
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Expires: 2004-08-20
Abstract
Abstract A method of making a filter media for use in a filter employed to separate water and particulate material from a liquid to be purified, such as a hydrocarbon fuel. The method includes the steps of providing a fibrous mat of material adapted to mechanically separate particulate material from a liquid to be purified, applying starch-polyacrylonitrile graft polymer in dry, granular form to the mat, and fixing the co-polymer to the mat by spraying the mat with a volatile solvent containing a small amount of water.
Inventors
- 👤 William R. Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:57
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/06; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/04; B01D17/045; B01D17/08; B01D17/10; B01D39/00; B01D39/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A method of making a filter media to be employed in a filter used to separate water and particulate material from a liquid to be purified comprising the steps of: providing a fibrous mat of material adapted to mechanically separate particulate material from a liquid to be purified; applying starch-polyacrylonitrile graft copolymer as a dry granular material to said mat; and fixing said copolymer to said mat.
Claim 2
Independent Claim
67 words
A method of making a filter media to be employed in a filter used to separate water and particulate material from a liquid to be purified comprising the steps of: providing a fibrous mat of material adapted to mechanically separate particulate material from a liquid to be purified; applying starch-polyacrylonitrile graft copolymer as a dry granular material to said mat; and fixing said copolymer to said mat.
Claim 3
Dependent Claim
24 words
The filter media of claim 1 wherein the amount of copolymer applied to different portions of the mat is varied in a predetermined fashion.
Claim 4
Dependent Claim
36 words
The method of claim 1 wherein the step of applying is performed by directing said dry, granular copolymer at one side of the mat while applying a partial vacuum to the opposite side of the mat.
Claim 5
Dependent Claim
26 words
The method of claim 2 including the step of substantially continuously advancing the mat from a station for said applying to a station for said fixing.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the step of fixing is performed by wetting the mat after the step of applying.
Claim 7
Independent Claim
78 words
A method of making a filter media to be employed in a filter used to separate water and particulate material from a liquid to be purified comprising the steps of: providing a fibrous mat of material adapted to mechanically separate particulate material from a liquid to be purified; applying dry, granular starch-polyacrylonitrile graft copolymer to said mat; and fixing said copolymer to said mat by spraying the mat with a volatile solvent containing a small percentage of water.
Claim 8
Independent Claim
78 words
A method of making a filter media to be employed in a filter used to separate water and particulate material from a liquid to be purified comprising the steps of: providing a fibrous mat of material adapted to mechanically separate particulate material from a liquid to be purified; applying dry, granular starch-polyacrylonitrile graft copolymer to said mat; and fixing said copolymer to said mat by spraying the mat with a volatile solvent containing a small percentage of water.
Claim 9
Dependent Claim
13 words
The method of claim 6 wherein said mat is a glass fiber mat.
Claim 10
Independent Claim
93 words
A method of making a filter media to be employed in a filter used to separate water and particulate material from a liquid to be purified comprising the steps of: providing a mat of glass fibers adapted to accomplish a desired degree of separation of particulate material from the liquid to be purified; applying dry, granular starch-polyacrylonitrile graft copolymer to the mat so as to at least partially penetrate the mat; and spraying the mat with a lower alcohol containing a small percentage of water to bond the copolymer to the glass fibers.
Claim 11
Independent Claim
93 words
A method of making a filter media to be employed in a filter used to separate water and particulate material from a liquid to be purified comprising the steps of: providing a mat of glass fibers adapted to accomplish a desired degree of separation of particulate material from the liquid to be purified; applying dry, granular starch-polyacrylonitrile graft copolymer to the mat so as to at least partially penetrate the mat; and spraying the mat with a lower alcohol containing a small percentage of water to bond the copolymer to the glass fibers.
Claim 12
Independent Claim
77 words
A method of making a filter media to be employed in a filter used to separate water and particulate material from a liquid to be purified comprising the steps of: providing a fibrous mat of material adapted to mechanically separate particulate material from a liquid to be purified; applying dry, granular starch-polyacrylonitrile graft copolymer to said mat; and fixing said copolymer to said mat by directing a fluid containing a small percentage of water at the mat.
Claim 13
Independent Claim
77 words
A method of making a filter media to be employed in a filter used to separate water and particulate material from a liquid to be purified comprising the steps of: providing a fibrous mat of material adapted to mechanically separate particulate material from a liquid to be purified; applying dry, granular starch-polyacrylonitrile graft copolymer to said mat; and fixing said copolymer to said mat by directing a fluid containing a small percentage of water at the mat.
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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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |