Patent US4880622A successfully refreshed from Google Patents.
US4880622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble phosphazene polymers having pharmacological applications
Assignee: Research Corp Technologies Inc
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Filing: 1986-05-20
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Granted: 1989-11-14
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Expires: 2006-05-20
Abstract
Abstract Novel poly(organophosphazene) polymers are used for the controlled release of pharmaceuticals, pesticides, herbicides, plant growth regulators and fertilizers. These polymers also act as foam control agents.
Inventors
- 👤 Harry R. Allcock
- 👤 Paul E. Austin
- 👤 Sukky Kwon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:16
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/025; A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A controlled release article of manufacture comprising a member selected from the group consisting of pharmaceuticals, pesticides, herbicides, plant growth regulators, and fertilizers in a physical admixture with a matrix of a polymer of the formula: [NPR(R.sub.2)]n wherein (a) R is selected from the group consisting of lower alkoxy ethers or polyethers, imines, polyimines, sulfides, polysulfides, esters and polyesters, and (b) n is from about 10 to about 20,000.
Claim 2
Dependent Claim
69 words
A controlled release article of manufacture comprising a member selected from the group consisting of pharmaceuticals, pesticides, herbicides, plant growth regulators, and fertilizers in a physical admixture with a matrix of a polymer of the formula: [NPR(R.sub.2)]n wherein (a) R is selected from the group consisting of lower alkoxy ethers or polyethers, imines, polyimines, sulfides, polysulfides, esters and polyesters, and (b) n is from about 10 to about 20,000.
Claim 3
Dependent Claim
10 words
The article of claim 1 wherein R is a polyether.
Claim 4
Dependent Claim
25 words
The article of manufacture of claim 1 where R is: Alk--OCH.sub.2 CH.sub.2).sub.x O-- x is from 1 to about 100 and Alk is lower alkyl.
Claim 5
Dependent Claim
22 words
The article of manufacture of claim 1 where R is: ##STR4## x is from 1 to about 100 Alk is lower alkyl.
Claim 6
Dependent Claim
27 words
The article of manufacture of claim 1 where R is: ##STR5## the sum of y and z is from 2 to about 100 Alk is lower alkyl.
Claim 7
Dependent Claim
16 words
The article of manufacture of any of claims 1 through 5 where said polymer is cross-linked.
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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |