Patent EP0003003A1 successfully refreshed from Google Patents.
EP0003003A1
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System and method for dispensing volatile airtreating agents
Assignee: Airwick AG
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Filing: 1978-12-22
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Granted: —
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Expires: 1998-12-22
Abstract
Abstract A system for the controlled release of air treating material comprising a hydrophilic membrane forming part of the wall of a reservoir containing an air-treating ingredient in aqueous medium, the membrane serving as the means for releasing vapors of the ingredient and water vapor to the atmosphere and for controlling the rate of release. The release is practically constant, and fractionation of components of the air-treating ingredient and of the latter and water is reduced or practically eliminated.
Inventors
- 👤 Ping I. Dr. Lee
- 👤 Eduard K. Kleiner
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:45
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
131 words
A dispensing system for vapors of a volatile odor-controlling material comprising a closed reservoir and a membrane forming at least a portion of the wall of said reservoir and having an external surface in contact with the surrounding atmosphere, and an odor-controlling agent-containing liquid in said reservoir in contact with the internal surface of said membrane, characterized in that, in combination, a) said odor-controlling agent is an essential oil- p type air-treating agent in the reservoir; b) said membrane is a hydrophilic membrane mechanically resistant to water up to 60°C and having an equilibrium water content of at least 15 % by weight calculated on the total weight of the membrane; and c) said liquid is an aqueous dispersion of said air-treating agent defined under a) in an aqueous dispersion medium.
Claim 2
Dependent Claim
131 words
A dispensing system for vapors of a volatile odor-controlling material comprising a closed reservoir and a membrane forming at least a portion of the wall of said reservoir and having an external surface in contact with the surrounding atmosphere, and an odor-controlling agent-containing liquid in said reservoir in contact with the internal surface of said membrane, characterized in that, in combination, a) said odor-controlling agent is an essential oil- p type air-treating agent in the reservoir; b) said membrane is a hydrophilic membrane mechanically resistant to water up to 60°C and having an equilibrium water content of at least 15 % by weight calculated on the total weight of the membrane; and c) said liquid is an aqueous dispersion of said air-treating agent defined under a) in an aqueous dispersion medium.
Claim 3
Dependent Claim
17 words
The dispensing system of claim 1, wherein said equilibrium water content is at least about 30 %.
Claim 4
Dependent Claim
18 words
The dispensing system of claim 1, wherein the thickness of the membrane ranges from 0.005 to 0.05 cm.
Claim 5
Dependent Claim
24 words
The dispensing system of claim 1, wherein the membrane shows from 120 to 200 % of swelling in contact with water at room temperature.
Claim 6
Dependent Claim
13 words
The dispensing system of claim 1, wherein said air-treating agent is an essence.
Claim 7
Dependent Claim
47 words
-6. The dispensing system of claim 1, wherein said aqueous dispersion contains, per 100 parts by weight thereof from 0.5 to 25 parts by weight of said air-treating agent and correspondingly from about 97 to 45 parts by weight of water or a liquid water/organic solvent mixture.
Claim 8
Dependent Claim
51 words
The dispensing system of claim 5,wherein said essence is present in an amount of from 0.5 to 5 parts by weight, and correspondingly the aqueous dispersion medium is present in an amount of from about 97 to 80 parts by weight, in every 100 parts by weight of said aqueous dispersion.
Claim 9
Dependent Claim
31 words
The dispensing system of one of claims 1 to 7, wherein said aqueous dispersion is a liquid-water-organic solvent mixture selected from the group consisting of water-alcohol, water-glycol, water-ketone and water- aldehyde.
Claim 10
Dependent Claim
51 words
The dispensing system of one of claims 1 to 7, wherein said hydrophilic membrane is selected from the membranes consisting of cellophane; Cuprophan; high molecular weight, fully hydrolyzed polyvinyl alcohol; crosslinked polyvinyl alcohol; hydrogels; polyvinyl chloride containing inert, absorptive filler; cellulose triacetate; copolyether polycarbonate; polyethylene glycol-polyethylene terephthalate copolymer; and hydrophilic polyurethane.
Claim 11
Dependent Claim
20 words
The dispensing system of claim 9, wherein said hydrophilic membrane is a membrane of polyvinyl alcohol insoluble in cold water.
Claim 12
Dependent Claim
25 words
The dispensing system of claim 9, wherein said hydrophilic membrane consists of hydroxyethyl methacrylate hydrogel having an equilibrium water content of about 25 to 30%.
Claim 13
Dependent Claim
23 words
The dispensing system of claim 9, wherein said hydrophilic membrane consists of cellophane having an equilibrium water content of about 50 to 55%.
Claim 14
Dependent Claim
47 words
The dispensing system of claim 9, wherein said hydrophilic membrane consists of cross-linked block-polymer of from 60 to 80% by weight of 2-hydroxyethyl methacrylate ; and correspondingly from 40 to 20% of isocyanate-terminated polyether-bisurethane having an equilibrium water content of from about 15 to 25% by weight.
Claim 15
Dependent Claim
19 words
The dispensing system of claim 9, wherein said hydrophilic membrane consists of a filter paper coated with a poly(hydroxyethyl-methacrylate).
Claim 16
Dependent Claim
35 words
The dispensing system of claim 9, wherein said hydrophilic membrane consists of a microporous hydrophilic polyvinylchloride film containing an inert absorptive filler and having an equilibrium water content of about 50 to 60% by weight..
Claim 17
Dependent Claim
35 words
The dispensing system of one of claims 1 to 7, wherein the walls of said reservoir other than said membrane are collapsible and the said liquid fills said reservoir at all times until complete consumption.
Claim 18
Dependent Claim
24 words
The dispensing system of one of claims 1 to 7 wherein the walls of said reservoir are constituted by said membrane and are collapsible.
References Cited (Backward Citations)
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