Patent US253519A successfully refreshed from Google Patents.
Patent US4267281A successfully refreshed from Google Patents.
US4267281A
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Controlled release pesticides
Assignee: HOPKINS MADISON WISCONSIN A CORP OF WISCONSIN
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Filing: 1979-07-20
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Granted: 1981-05-12
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Expires: 1999-07-20
Abstract
Abstract Controlled release pesticides are prepared by reacting an isocyanate derivative of a pesticide with a polymer having pendant groups containing a reactive hydrogen to obtain a novel pesticide-polymer system in which the pesticide is chemically bonded to the polymer. Active pesticidal material is released from the pesticide-polymer system by hydrolysis or chemical depolymerization under conditions of use.
Inventors
- 👤 Charles L. McCormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:54
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; C08F; C08F8/00; C08F8/30; C08G18/28; C08G18/2805; C08G18/40; C08G18/62; C08G18/6212
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A pesticide-polymer having a macromolecular backbone with pendant pesticidal groups chemically linked thereto by linkages which are broken under environmental conditions of use to controllably release an effective amount of active pesticide, which pesticide-polymer is prepared by reacting a polymer having pendant hydroxy groups, said polymer being selected from polyvinyl alcohol and polyvinylalcohol copolymers, with a pesticide derivative having an --NCO group, said pesticide derivative having been prepared from a pesticide having an --NH 2 group.
Claim 2
Dependent Claim
76 words
A pesticide-polymer having a macromolecular backbone with pendant pesticidal groups chemically linked thereto by linkages which are broken under environmental conditions of use to controllably release an effective amount of active pesticide, which pesticide-polymer is prepared by reacting a polymer having pendant hydroxy groups, said polymer being selected from polyvinyl alcohol and polyvinylalcohol copolymers, with a pesticide derivative having an --NCO group, said pesticide derivative having been prepared from a pesticide having an --NH 2 group.
Claim 3
Dependent Claim
12 words
A pesticide-polymer of claim 1 in which the polymer is polyvinyl alcohol.
Claim 4
Dependent Claim
13 words
A pesticide-polymer of claim 2 in which the pesticide derivative is 4-isocyanato-6-tert-butyl-3-(methylthio)-as-triazine-5(4H) one.
Claim 5
Dependent Claim
19 words
A pesticide-polymer of claim 2 in which the polymer is polyvinyl alcohol and the pesticide derivative is 4-isocyanato-6-tert-butyl-3-(methylthio)-as-triazine-5(4H) one.
Claim 6
Dependent Claim
13 words
A pesticide-polymer of claim 4 in which the pesticide derivative is 3-isocyanato-2,5-dichlorobenzoic acid.
References Cited (Backward Citations)
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Cited
US3470148A
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US3539373A
Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |