US3995489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Malonic acid derivative composition for forming thermoparticulating coating
Assignee: Westinghouse Electric Corp
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Filing: 1975-04-15
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Granted: 1976-12-07
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Expires: 1995-04-15
Abstract
Abstract A composition is disclosed of a malonic acid derivative, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the malonic acid derivative in the coating forms particles in the gas stream which are detected by a monitor.
Inventors
- 👤 James D. B. Smith
- 👤 David C. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:03
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/10
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
53 words
A method of protecting electrical apparatus from damage due to overheating and for thereafter determining the location of said overheating, said apparatus including a gas stream and a monitor for detecting particles in said gas stream and for emitting a signal when said particles are detected comprising: A. preparing a composition which comprises:
Claim 2
Independent Claim
53 words
A method of protecting electrical apparatus from damage due to overheating and for thereafter determining the location of said overheating, said apparatus including a gas stream and a monitor for detecting particles in said gas stream and for emitting a signal when said particles are detected comprising: A. preparing a composition which comprises:
Claim 3
Dependent Claim
48 words
at least one compound having the general formula ##STR2## where R is selected from the group consisting of alkyl to C 10 , aryl, alkyl aryl to C 10 , cycloaliphatic, and heterocyclic, and R 1 is selected from the group consisting of R and hydrogen; and 2.
Claim 4
Dependent Claim
48 words
at least one compound having the general formula ##STR2## where R is selected from the group consisting of alkyl to C 10 , aryl, alkyl aryl to C 10 , cycloaliphatic, and heterocyclic, and R 1 is selected from the group consisting of R and hydrogen; and 2.
Claim 5
Dependent Claim
50 words
a solution of at least one resinous carrier curable and stable at 60° C and unreactive with said compound; B. applying said composition to said electrical apparatus at positions exposed to said gas stream; C. evaporating said solvent; and D. monitoring said gas stream for the presence of particulates therein.
Claim 6
Dependent Claim
50 words
a solution of at least one resinous carrier curable and stable at 60° C and unreactive with said compound; B. applying said composition to said electrical apparatus at positions exposed to said gas stream; C. evaporating said solvent; and D. monitoring said gas stream for the presence of particulates therein.
Claim 7
Dependent Claim
33 words
A method according to claim 1 including the additional last step of inspecting said apparatus visually for blistered and darkened areas, after a signal has been emitted, to locate the area of overheating.
Claim 8
Dependent Claim
30 words
A method according to claim 1 including the additional last steps of collecting a sample of said gas stream after a signal has been emitted and chemically analyzing said sample.
Claim 9
Dependent Claim
15 words
A method according to claim 1 wherein said compound contains at least 5 carbon atoms.
Claim 10
Dependent Claim
12 words
A method according to claim 4 wherein said compound is monoethylmalonic acid.
Claim 11
Dependent Claim
12 words
A method according to claim 4 wherein said compound is dimethylmalonic acid.
Claim 12
Dependent Claim
41 words
A method according to claim 1 wherein the amount of said compound is about 20 to about 250 phr and the amount of the solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 13
Dependent Claim
38 words
A method according to claim 7 wherein the amount of said compound is about 40 to about 60 phr and the amount of said solvent is about 45 to about 55% (by weight based on said resinous carrier).
Claim 14
Dependent Claim
14 words
A method according to claim 1 wherein said resinous carrier is an epoxy resin.
Claim 15
Dependent Claim
21 words
A method according to claim 9 which includes about 0.1 to about 3 phr of a drier for said epoxy resin.
Claim 16
Dependent Claim
26 words
A method according to claim 10 which is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said compound.
Claim 17
Dependent Claim
14 words
A method according to claim 1 wherein the solvent in said solution is toluene.
Claim 18
Dependent Claim
14 words
A method according to claim 1 wherein said compound is dispersed in said solution.
Claim 19
Dependent Claim
12 words
A method according to claim 1 wherein said resinous carrier is air-dryable.
Claim 20
Dependent Claim
115 words
A thermal detection system for electrical apparatus cooled by a gas stream comprising a monitor for detecting the presence of particles in said gas stream, and a coating which comprises a solid layer of a composition of at least one compound having the general formula ##STR3## where R is selected from the group consisting of alkyl to C 10 , aryl, alkyl aryl to C 10 , cycloaliphatic, and heterocyclic, and R 1 is selected from the group consisting of R and hydrogen, and at least one resinous carrier curable and stable at 60° C and unreactive with said compound, said coating being on a portion of said electrical apparatus exposed to said gas stream.
Claim 21
Dependent Claim
115 words
A thermal detection system for electrical apparatus cooled by a gas stream comprising a monitor for detecting the presence of particles in said gas stream, and a coating which comprises a solid layer of a composition of at least one compound having the general formula ##STR3## where R is selected from the group consisting of alkyl to C 10 , aryl, alkyl aryl to C 10 , cycloaliphatic, and heterocyclic, and R 1 is selected from the group consisting of R and hydrogen, and at least one resinous carrier curable and stable at 60° C and unreactive with said compound, said coating being on a portion of said electrical apparatus exposed to said gas stream.
Claim 22
Dependent Claim
17 words
A thermal detection system according to claim 15 wherein said compound contains at least five carbon atoms.
Claim 23
Dependent Claim
14 words
A thermal detection system according to claim 16 wherein said compound is monoethylmalonic acid.
Claim 24
Dependent Claim
14 words
A thermal detection system according to claim 16 wherein said compound is dimethylmalonic acid.
References Cited (Backward Citations)
US3427880A
Cited
US3807218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |