Patent US4483771A successfully refreshed from Google Patents.
US4483771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer filter
Assignee: Individual
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Filing: 1983-08-08
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Granted: 1984-11-20
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Expires: 2003-08-08
Abstract
Abstract A multi-layer filter combination having a macrofilter layer with a predetermined thickness and two major sides including porous material impregnable with bacteria-destroying medication and having pore sizes in the range from about 1 micron to about 120 microns. There is also a microfilter layer having a prearranged thickness smaller than the thickness of the macrofilter and including a porous membrane having pore sizes from about 0.1 micron to about 10 microns. The microfilter layer is mechanically bonded to at least a major side of the macrofilter layer, whereby inhibiting transfer of any remaining live bacteria which may have survived exposure to the bacteria-destroying medication, and which may attempt to pass outwardly beyond the microfilter layer. The medication is either an antibiotic and an iodophore.
Inventors
- 👤 Elizabeth Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:48
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/1218; A; A61; A61L; A61L9/00; B01D35/00; B01D39/00; B01D69/14; B01D69/141; B01D2325/00; B01D2325/48
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
115 words
A multilayer filter combination, comprising a macrofilter layer having a predetermined thickness and two major sides, said macrofilter layer including porous material impregnated with bacteria-destroying medication and having pore sizes in the range from about 1 micron to about 120 microns, and a microfilter layer having a prearranged thickness smaller than said predetermined thickness, and including a porous membrane having pore sizes from about 0.1 micron to about 10 microns, said microfilter layer being mechanically bonded to at least a major side of said macrofilter layer, whereby transfer of any remaining live bacteria which may have survived exposure to said bacteria-destroying medication, and which may attempt to pass outwardly beyond said microfilter layer is inhibited.
Claim 2
Dependent Claim
115 words
A multilayer filter combination, comprising a macrofilter layer having a predetermined thickness and two major sides, said macrofilter layer including porous material impregnated with bacteria-destroying medication and having pore sizes in the range from about 1 micron to about 120 microns, and a microfilter layer having a prearranged thickness smaller than said predetermined thickness, and including a porous membrane having pore sizes from about 0.1 micron to about 10 microns, said microfilter layer being mechanically bonded to at least a major side of said macrofilter layer, whereby transfer of any remaining live bacteria which may have survived exposure to said bacteria-destroying medication, and which may attempt to pass outwardly beyond said microfilter layer is inhibited.
Claim 3
Dependent Claim
24 words
A multilayer filter combination as claimed in claim 1, wherein said bacteria-destroying medication is selected from the group consisting of antibiotics and an iodophore.
Claim 4
Dependent Claim
15 words
The multilayer filter combination as claimed in claim 2, wherein said bacteria-destroying medication is aqueous.
Claim 5
Dependent Claim
15 words
The multilayer filter combination as claimed in claim 2, wherein said bacteria-destroying medication is powdered.
Claim 6
Dependent Claim
23 words
The multilayer filter as claimed in claim 2, wherein said antibiotics are selected from a group consisting of penicillin, tetracyclene, kanamycin, and sulfonamides.
Claim 7
Dependent Claim
54 words
A multilayer filter combination as claimed in claim 1, wherein said predetermined thickness is about 0.005 inches, and wherein said porous membrane of said microfilter layer includes a unitary organic resin film having pore sizes in the range from about 0.1 microns to about 10 microns, and formed with random and irregular passages therethrough.
Claim 8
Dependent Claim
19 words
The multilayer filter as claimed in claim 1, wherein said macrofilter layer is a substrate for said microfilter layer.
Claim 9
Dependent Claim
22 words
A multilayer filter as claimed in claim 1, wherein said microfilter layer is bonded to said macrofilter layer by being coated thereon.
Claim 10
Dependent Claim
19 words
A multilayer filter as claimed in claim 1, wherein said microfilter layer completely and tightly envelops said macrofilter layer.
Claim 11
Dependent Claim
20 words
A multilayer filter as claimed in claim 1, and wherein said microfilter layer is composed of a synthetic plastic material.
Claim 12
Dependent Claim
38 words
A multilayer filter as claimed in claim 10, wherein said synthetic plastic material consists of a material selected from the group of cellulose triacetate, cellulose esters, polyvinyl chloride, copolymers of polyvinyl chloride, acrylic polymer, polytetrafluroethylene, and regenerated cellulose.
Claim 13
Dependent Claim
29 words
A multilayer filter as claimed in claim 10, wherein said synthetic plastic material consists of a material selected from the group of nylon, polyester, or any membrane forming material.
Claim 14
Dependent Claim
29 words
A multilayer filter as claimed in claim 10, wherein said synthetic plastic material consists of a material selected from the group consisting of an acetal resin and polyvinyl difluoride.
Claim 15
Dependent Claim
18 words
A multilayer filter as claimed in claim 1, wherein said macrofilter layer is composed of synthetic plastic material.
Claim 16
Dependent Claim
25 words
A multilayer filter as claimed in claim 14, wherein said synthetic plastic material is selected from the group consisting of polyethylene, polypropylene, nylon, and teflon.
Claim 17
Dependent Claim
16 words
A multilayer filter as claimed in claim 1, wherein said macrofilter layer is composed of charcoal.
Claim 18
Dependent Claim
14 words
A multilayer filter as claimed in claim 1, wherein said microfilter layer is hydrophobic.
Claim 19
Dependent Claim
14 words
A multilayer filter as claimed in claim 1, wherein said microfilter layer is hydrophilic.
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |