US4906488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of permeant
Assignee: Arcade Inc
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Filing: 1987-07-01
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Granted: 1990-03-06
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Expires: 2007-07-01
Abstract
Abstract Forming a solution (preferably a true or complete solution) of mer in any permeant, reacting mer in presence of permeant substantially without rearrangement of the liquid system into separate phases and substantially without encapsulation (defined as any form of entrapment by polymeric solidification, including microencapsulation) and recovering a liquid product useful in formulating slow-release products.
Inventors
- 👤 Ivo E. Pera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:23
CPC Classifications
A; A61; A61Q; A61Q13/00; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A61K; A61K47/00; A61K47/30; A61K47/32; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/817; A61K8/8176; A61K9/00; A61K9/0012; A61K9/0014; A61L; A61L9/00; A61L9/01; A61L9/015; A61L9/04; A61L9/042; C; C09; C09D; C09D11/00; C09D11/02; C09D11/03; A61K2800/00; A61K2800/40; A61K2800/56; A61Q17/00; A61Q17/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
153 words
A method of modifying a permeant comprising forming a liquid system consisting of a polymer-containing member selected from the group consisting of polyvinylpyrrolidone or a derivative thereof, a combination of polyvinylpyrrolidone or a derivate thereof and a plasticizer, and a combination of polyvinylpyrrolidone, a solvent and a plasticizer, reacting the polymer-containing member in the presence of the permeant for significantly increasing the effective molecular weight of the polymer therein under conditions which substantially preserve at least one useful permeant function of the permeant, continuing the reaction under such conditions to a sufficient extent for substantially reducing the diffusion rate, volatility, flammability, toxicity or susceptibility to oxidation or other form of environmental attack upon the permeant and recovering a reaction product having a consistency ranging from a liquid to a non-self-supporting soft gel, from which the permeant may escape for performing its permeant function in or on a host medium outside the reaction product.
Claim 2
Independent Claim
153 words
A method of modifying a permeant comprising forming a liquid system consisting of a polymer-containing member selected from the group consisting of polyvinylpyrrolidone or a derivative thereof, a combination of polyvinylpyrrolidone or a derivate thereof and a plasticizer, and a combination of polyvinylpyrrolidone, a solvent and a plasticizer, reacting the polymer-containing member in the presence of the permeant for significantly increasing the effective molecular weight of the polymer therein under conditions which substantially preserve at least one useful permeant function of the permeant, continuing the reaction under such conditions to a sufficient extent for substantially reducing the diffusion rate, volatility, flammability, toxicity or susceptibility to oxidation or other form of environmental attack upon the permeant and recovering a reaction product having a consistency ranging from a liquid to a non-self-supporting soft gel, from which the permeant may escape for performing its permeant function in or on a host medium outside the reaction product.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the mer includes polyvinylpyrrolidone having a molecular weight in the range of about 5,000 to about 200,000.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the mer includes polyvinylpyrrolidone having a molecular weight in the range of about 7,000 to about 160,000.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein said plasticizer is diethylphthalate.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein said permeant is an olfactant.
Claim 7
Dependent Claim
11 words
The method of claim 1 wherein said permeant is a flavorant.
Claim 8
Dependent Claim
5 words
The product of claim 1.
Claim 9
Dependent Claim
23 words
The product of claim 7 wherein the mer includes polyvinylpyrrolidone having a molecular weight in the range of about 5,000 to about 200,000.
Claim 10
Dependent Claim
23 words
The product of claim 7 wherein the mer includes polyvinylpyrrolidone having a molecular weight in the range of about 7,000 to about 160,000.
Claim 11
Dependent Claim
10 words
The product of claim 7 wherein said plasticizer is diethylphthalate.
Claim 12
Dependent Claim
11 words
The product of claim 7 wherein said permeant is an olfactant.
Claim 13
Dependent Claim
11 words
The product of claim 7 wherein said permeant is a flavorant.
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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |