Patent US4753728A successfully refreshed from Google Patents.
US4753728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water filter
Assignee: Access Business Group International LLC
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Filing: 1986-04-07
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Granted: 1988-06-28
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Expires: 2006-04-07
Abstract
Abstract The specification discloses a double shell filter comprising an inner shell of bounded 80 to 400 U.S. mesh screen carbon particles and an outer shell of bonded 20 to 80 mesh screen carbon particles wherein the inner and outer particles are bonded internally to each other and the two shells are bonded together preferably by an ultra high molecular weight polymer binder having a melt index of less than about 1 gram per ten minutes as determined by ASTM D1238 at 190 degrees C. and 15 kilograms load.
Inventors
- 👤 Herbert J. VanderBilt
- 👤 Timothy D. Modert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:22
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2055; B01D39/2058; B01D39/2062; C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; C02F1/28; C02F1/283; C02F1/288; B01D2239/00; B01D2239/06; B01D2239/0604; B01D2239/0618; B01D2239/065; B01D2239/0681; B01D2239/08; B01D2239/086; B01D2239/12; B01D2239/1291; C02F2201/00; C02F2201/002; C02F2201/006
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
65 words
A carbon particle filter comprising carbon particles bonded into a filter block by a low melt index polymeric material having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load, whereby said polymeric material will tackify at elevated temperatures without becoming sufficiently liquid to substantially wet the carbon particles.
Claim 2
Dependent Claim
65 words
A carbon particle filter comprising carbon particles bonded into a filter block by a low melt index polymeric material having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load, whereby said polymeric material will tackify at elevated temperatures without becoming sufficiently liquid to substantially wet the carbon particles.
Claim 3
Dependent Claim
20 words
The carbon particle filter of claim 1 in which said melt index is less than 0.5 grams per 10 minutes.
Claim 4
Dependent Claim
30 words
The carbon particle filter of claim 2 wherein said polymeric material comprises an ultra high molecular weight polymer having a molecular weight of from about 4 to about 6 million.
Claim 5
Dependent Claim
30 words
The carbon particle filter of claim 1 wherein said polymeric material comprises an ultra high molecular weight polymer having a molecular weight of from about 4 to about 6 million.
Claim 6
Dependent Claim
13 words
The carbon particle filter of claim 4 wherein said polymeric material is polyethylene.
Claim 7
Dependent Claim
13 words
The carbon particle filter of claim 1 wherein said polymeric material is polyethylene.
Claim 8
Dependent Claim
20 words
The carbon particle filter of claim 1 in which said melt index is less than 0.1 gram per 10 minutes.
Claim 9
Dependent Claim
30 words
The carbon particle filter of claim 7 wherein said polymeric material comprises an ultra high molecular weight polymer having a molecular weight of from about 4 to about 6 million.
Claim 10
Dependent Claim
13 words
The carbon particle filter of claim 7 wherein said polymeric material is polyethylene.
Claim 11
Dependent Claim
92 words
A carbon particle filter comprising: an inner shell of bonded 80 to 400 U.S. Series mesh screen carbon particles bonded to each other; an outer shell of bonded 20 to 80 U.S. Series mesh screen carbon particles bonded to each other and to said inner shell whereby a unitized, integral double shell carbon filter is obtained which will allow water to pass more fully than a comparably sized single shell bonded filter of 80 to 400 U.S. Series mesh screen carbon particles without significantly adversely affecting the removal qualities of the filter.
Claim 12
Dependent Claim
92 words
A carbon particle filter comprising: an inner shell of bonded 80 to 400 U.S. Series mesh screen carbon particles bonded to each other; an outer shell of bonded 20 to 80 U.S. Series mesh screen carbon particles bonded to each other and to said inner shell whereby a unitized, integral double shell carbon filter is obtained which will allow water to pass more fully than a comparably sized single shell bonded filter of 80 to 400 U.S. Series mesh screen carbon particles without significantly adversely affecting the removal qualities of the filter.
Claim 13
Dependent Claim
32 words
The filter of claim 10, in which said inner shell is comprised of 80 to 325 mesh carbon particles and said outer shell is comprised of 20 to 60 mesh carbon particles.
Claim 14
Dependent Claim
42 words
The filter of claim 11 in which said carbon particles in said inner and outer shells are bonded together by a low melt index polymer material which will tackify at elevated temperatures without becoming sufficiently liquid to substantially wet the carbon particles.
Claim 15
Dependent Claim
36 words
The filter of claim 12 in which said binder has a melt index of less than about 0.1 gram per ten minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load.
Claim 16
Dependent Claim
22 words
The filter of claim 13 in which said binder has a melt index of less than about 0.5 grams per ten minutes.
Claim 17
Dependent Claim
19 words
The filter of claim 14 in which said melt index is less than about 0.1 gram per ten minutes.
Claim 18
Dependent Claim
28 words
The filter of claim 15 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
Claim 19
Dependent Claim
28 words
The filter of claim 13 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
Claim 20
Dependent Claim
28 words
The filter of claim 12 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
Claim 21
Dependent Claim
64 words
The filter of claim 10, which includes an inner porous sleeve through which water will pass, said sleeve having a diameter of from one-half to one and one-half inches; said inner shell fitting around said sleeve and having an exterior diameter of three to four inches; said outer shell fitting around said inner shell and having an outside diameter of four to five inches.
Claim 22
Dependent Claim
42 words
The filter of claim 19 in which said carbon particles in said inner and outer shells are bonded together by a low melt index polymer material which will tackify at elevated temperatures without becoming sufficiently liquid to substantially wet the carbon particles.
Claim 23
Dependent Claim
36 words
The filter of claim 20 in which said binder has a melt index of less than about 0.1 gram per ten minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load.
Claim 24
Dependent Claim
22 words
The filter of claim 21 in which said binder has a melt index of less than about 0.5 grams per ten minutes.
Claim 25
Dependent Claim
19 words
The filter of claim 22 in which said melt index is less than about 0.1 gram per ten minutes.
Claim 26
Dependent Claim
28 words
The filter of claim 23 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
Claim 27
Dependent Claim
28 words
The filter of claim 21 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
Claim 28
Dependent Claim
28 words
The filter of claim 20 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
Claim 29
Dependent Claim
42 words
The filter of claim 10 in which said carbon particles in said inner and outer shells are bonded together by a low melt index polymer material which will tackify at elevated temperatures without becoming sufficiently liquid to substantially wet the carbon particles.
Claim 30
Dependent Claim
36 words
The filter of claim 27 in which said binder has a melt index of less than about 0.1 gram per ten minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load.
Claim 31
Dependent Claim
22 words
The filter of claim 28 in which said binder has a melt index of less than about 0.5 grams per ten minutes.
Claim 32
Dependent Claim
19 words
The filter of claim 29 in which said melt index is less than about 0.1 gram per ten minutes.
Claim 33
Dependent Claim
28 words
The filter of claim 30 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
Claim 34
Dependent Claim
28 words
The filter of claim 29 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
Claim 35
Dependent Claim
28 words
The filter of claim 28 in which said polymer binder comprises an ultra high molecular weight polyethylene having a molecular weight of from about 4 to 6 million.
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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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |