US4062649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depletion indicator for controlled-release pesticide formulations
Assignee: United Industries Corp
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Filing: 1974-04-29
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Granted: 1977-12-13
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Expires: 1994-04-29
Abstract
Abstract The end of the useful life of a controlled-release formulation containing a volatile phosphate ester pesticide is signalled visually by change in the color of an indicator matrix positioned relative to the formulation so as to contact a representative proportion of the pesticide vapors as they are emitted from the formulation.
Inventors
- 👤 Jerome G. Kuderna
- 👤 Paul M. Saliman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:58
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/32; A01N25/18; G; G01; G01N; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/16; Y10T436/163333
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A method for visually determining the end of the effective life of a controlled-release formulation of a volatile phosphate ester pesticide of the formula ##STR3## wherein each R is alkyl of from 1 to 4 carbon atoms, R 1 is hydrogen, chlorine or bromine, hal is chlorine or bromine and X is oxygen or sulfur, which method comprises positioning a mixture of an inorganic base, a color-change indicator for acid/base reactions, an inert, absorbent carrier and a humectant, in a position relative to the formulation where it contacts essentially at all times a representative proportion of the pesticide vapors emitted from the formulation, the amount of base being predetermined, and directly related to, the effective life of the formulation, and ascertaining visually when the color of the indicator changes to the color of its neutral or basic form.
Claim 2
Independent Claim
138 words
A method for visually determining the end of the effective life of a controlled-release formulation of a volatile phosphate ester pesticide of the formula ##STR3## wherein each R is alkyl of from 1 to 4 carbon atoms, R 1 is hydrogen, chlorine or bromine, hal is chlorine or bromine and X is oxygen or sulfur, which method comprises positioning a mixture of an inorganic base, a color-change indicator for acid/base reactions, an inert, absorbent carrier and a humectant, in a position relative to the formulation where it contacts essentially at all times a representative proportion of the pesticide vapors emitted from the formulation, the amount of base being predetermined, and directly related to, the effective life of the formulation, and ascertaining visually when the color of the indicator changes to the color of its neutral or basic form.
Claim 3
Dependent Claim
11 words
A method according to claim 1 wherein the carrier is paper.
Claim 4
Dependent Claim
18 words
A method according to claim 2 wherein, referring to the phosphate ester pesticide, halogen present is middle halogen.
Claim 5
Dependent Claim
29 words
A method according to claim 3 wherein, referring to the phosphate ester pesticide, both of R are methyl, X is oxygen, R 1 is chlorine and hal is chlorine.
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) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |