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Patent US4618388A successfully refreshed from Google Patents.
US4618388A
Expired / Lapsed
US
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Water removing filter media and method of making the same
Assignee: Central Illinois Manufacturing Co
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Filing: 1984-09-11
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Granted: 1986-10-21
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Expires: 2004-09-11
Abstract
Abstract 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 filter media includes a porous material such as glass fiber having a density sufficient to provide the desired mechanical filtration and which carries a water insoluble, water-absorbing material as, for example, a starch-polyacrylonitrile graft copolymer. Also disclosed is a filter employing the media and a method of making the media.
Inventors
- 👤 William R. Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
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: 7
Claim 1
Independent Claim
99 words
A method of making a laminated, water absorbing mechanical filter media comprising the steps of: placing a water absorbing polymer in granular form on a fiberglass mat; dispersing the polymer in the mat; wetting the polymer with water at a surface of the mat sufficiently to make said surface sticky; applying a layer of filter paper to said surface while said surface is sticky; pressing the mat and the layer together to cause the polymer to contact the layer; and extracting sufficient water from the resulting laminate to cause the polymer to secure the mat and the layer together.
Claim 2
Independent Claim
99 words
A method of making a laminated, water absorbing mechanical filter media comprising the steps of: placing a water absorbing polymer in granular form on a fiberglass mat; dispersing the polymer in the mat; wetting the polymer with water at a surface of the mat sufficiently to make said surface sticky; applying a layer of filter paper to said surface while said surface is sticky; pressing the mat and the layer together to cause the polymer to contact the layer; and extracting sufficient water from the resulting laminate to cause the polymer to secure the mat and the layer together.
Claim 3
Dependent Claim
33 words
The method of claim 1 further including the step of fixing the polymer to the glass fibers in said mat by passing a fluid having a low percentage of water through the mat.
Claim 4
Dependent Claim
11 words
The method of claim 2 wherein the fluid is a gas.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein the fluid is a volatile liquid.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the steps of placing and dispersing are performed concurrently.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the steps of placing and dispersing are performed seriatum.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |