Patent US4988440A successfully refreshed from Google Patents.
US4988440A
Expired / Lapsed
US
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Cooking oil filter
Assignee: CLARIFICATION Tech Inc
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Filing: 1989-08-18
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Granted: 1991-01-29
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Expires: 2009-08-18
Abstract
Abstract An improved filter comprising a porous sheet of substantially uniform thickness having the following composition: 15% to 35% activated carbon; 15% to 40% calcium silicate, magnesium silicate, or mixtures thereof; 25% to 40% cellulosic fiber; up to 2% resin binder; and, optionally, 0% to 30% diatomaceous earth.
Inventors
- 👤 Robin D. Bernard
- 👤 John G. Gardner
- 👤 Jun Ueki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:16
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2055; B01D39/2058; B01D39/2062; A; A47; A47J; A47J37/00; A47J37/12; A47J37/1223; B01D29/00; B01D29/01; B01D29/05; B01D29/60; B01D29/606; B01D29/608; B01D29/96; B01D39/16; B01D39/18; B01D39/2068; B01D39/2072; B01D39/2079; B01D2239/00; B01D2239/08; B01D2239/086; B01D2239/12; B01D2239/1216; B01D2239/1225; B01D2239/1233; Y; Y10; Y10S; Y10S210/00; Y10S210/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
A filter having a porous body comprising the following composition ______________________________________
activated carbon 15% to 35%
calcium silicate, magnesium
15% to 40%
silicate, or mixtures thereof
cellulosic fiber 25% to 40%
resin binder .sup. up to 2%
diatomaceous earth 0% to 30%
______________________________________ all percentages herein by weight based on the total weight of the foregoing components.
Claim 2
Dependent Claim
57 words
A filter having a porous body comprising the following composition ______________________________________
activated carbon 15% to 35%
calcium silicate, magnesium
15% to 40%
silicate, or mixtures thereof
cellulosic fiber 25% to 40%
resin binder .sup. up to 2%
diatomaceous earth 0% to 30%
______________________________________ all percentages herein by weight based on the total weight of the foregoing components.
Claim 3
Dependent Claim
22 words
The filter of claim 1, wherein said porous body comprises a sheet having a substantially uniform thickness less than about 5 millimeters.
Claim 4
Dependent Claim
17 words
The filter of claim 2, wherein said thickness ranges from about 4 millimeters to about 4.5 millimeters.
Claim 5
Dependent Claim
23 words
The filter of claim 1, wherein said porous body has pores substantially ranging in size from about 0.5 micron to about 25 microns.
Claim 6
Dependent Claim
23 words
The filter of claim 1, wherein the mean pore size in said porous body ranges from about 2 microns to about 6 microns.
Claim 7
Dependent Claim
14 words
The filter of claim 1, wherein said calcium silicate component is synthetic calcium silicate.
Claim 8
Dependent Claim
12 words
The filter of claim 1, wherein said cellulosic fiber comprises wood pulp.
Claim 9
Dependent Claim
26 words
The filter of claim 1, wherein said resin binder ranges from about 1% to about 2% by weight of the total composition of said porous body.
Claim 10
Dependent Claim
13 words
The filter of claim 1, wherein said resin binder comprises a melamine-formaldehyde resin.
Claim 11
Dependent Claim
53 words
The filter of claim 1 further comprising: ______________________________________
activated carbon 25% to 35%
calcium silicate, magnesium
30% to 40%
silicate, or mixtures thereof
cellulosic fiber 30% to 40%
resin binder 1% to 2%
diatomaceous earth 0% to 15%
______________________________________ all percentages herein by weight based on the total weight of the foregoing components.
References Cited (Backward Citations)
US2601598A
Cited
US3019127A
Cited
US3327859A
Cited
US3356218A
Cited
US3880757A
Cited
US3933643A
Cited
US3968741A
Cited
US3849312A
Cited
US4079001A
Cited
US4025438A
Cited
US3983843A
Cited
US4032457A
Cited
US4859340A
Cited
US4043916A
Cited
US4395332A
Cited
US4238334A
Cited
US4282094A
Cited
US4404285A
Cited
US4517082A
Cited
US4591434A
Cited
US4623455A
Cited
US4676904A
Cited
US4668390A
Cited
US4768426A
Cited
US4702827A
Cited
US4826594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |