US3957014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoparticulating tape
Assignee: Westinghouse Electric Corp
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Filing: 1975-06-19
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Granted: 1976-05-18
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Expires: 1995-06-19
Abstract
Abstract A thermoparticulating tape is disclosed which comprises a flexible fibrous material, a compound which thermoparticulates at a temperature below 200 DEG C dispersed throughout the flexible fibrous material, and a flexible outer coating over the flexible fibrous material through which the products formed when the compound thermoparticulates can pass. The tape is best made by dissolving the thermoparticulating compound in a solvent, immersing the fibrous material in the solution, evaporating the solvent, and applying the outer coating to the fibrous material. An adhesive backing can be applied to the tape if desired. The tape is placed in an electrical apparatus cooled by a gas stream, in a position exposed to the gas stream. When overheating occurs the tape darkens and emits particles into the gas stream which are detected by a monitor.
Inventors
- 👤 David C. Phillips
- 👤 James D. B. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:08
CPC Classifications
G; G01; G01K; G01K11/00; Y; Y10; Y10S; Y10S116/00; Y10S116/14; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/266; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2098; Y10T442/2107; Y10T442/2115
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
47 words
A thermoparticulating tape comprising: a. a flexible fibrous material; b. a compound which thermoparticulates at a temperature below 200°C dispersed throughout said flexible, fibrous material; and c. a flexible outer coating over said flexible, fibrous material through which the products formed when said compound thermoparticulates can pass.
Claim 2
Dependent Claim
47 words
A thermoparticulating tape comprising: a. a flexible fibrous material; b. a compound which thermoparticulates at a temperature below 200°C dispersed throughout said flexible, fibrous material; and c. a flexible outer coating over said flexible, fibrous material through which the products formed when said compound thermoparticulates can pass.
Claim 3
Dependent Claim
12 words
A tape according to claim 1 wherein said fibrous material is organic.
Claim 4
Dependent Claim
13 words
A tape according to claim 2 wherein said fibrous material is polyethylene terephthalate.
Claim 5
Dependent Claim
13 words
A tape according to claim 1 wherein said fibrous material is a mat.
Claim 6
Dependent Claim
22 words
A tape according to claim 1 wherein said fibrous material is 1/2 to 15 cm wide and 1 to 20 mils thick.
Claim 7
Dependent Claim
17 words
A tape according to claim 1 wherein said compound comprises 50 to 800% of said fibrous material.
Claim 8
Dependent Claim
13 words
A tape according to claim 6 wherein said compound comprises 200 to 600%.
Claim 9
Dependent Claim
32 words
A tape according to claim 1 wherein said compound is selected from the group consisting of malonic acid, derivatives of malonic acid, metal acetyl acetonates, blocked isocyanates, diazonium salts, and mixtures thereof.
Claim 10
Dependent Claim
12 words
A tape according to claim 8 wherein said compound is malonic acid.
Claim 11
Dependent Claim
17 words
A tape according to claim 1 which includes an adhesive coating on one side of said tape.
Claim 12
Dependent Claim
18 words
A tape according to claim 1 wherein said flexible outer coating is an epoxy or polyester (alkyd) resin.
Claim 13
Dependent Claim
18 words
A tape according to claim 1 wherein said outer coating is about 1/2 to about 2 mils thick.
Claim 14
Dependent Claim
20 words
A tape according to claim 1 wherein said compound which thermoparticulates is the only substance in said tape which thermoparticulates.
Claim 15
Independent Claim
47 words
A method of making a thermoparticulating tape comprising: a. dispersing throughout a flexible fibrous material a compound which thermoparticulates at a temperature below 200°C; and b. applying a flexible outer coating over said flexible fibrous material through which the products formed when said compound thermoparticulates can pass.
Claim 16
Independent Claim
47 words
A method of making a thermoparticulating tape comprising: a. dispersing throughout a flexible fibrous material a compound which thermoparticulates at a temperature below 200°C; and b. applying a flexible outer coating over said flexible fibrous material through which the products formed when said compound thermoparticulates can pass.
Claim 17
Dependent Claim
30 words
A method according to claim 14 wherein said compound is dispersed by immersing said flexible fibrous material in a solution of said compound and evaporating the solvent from said solution.
Claim 18
Dependent Claim
23 words
A method according to claim 15 wherein said solution is 40 to 80% solids and said solvent has a boiling point below 60°C.
Claim 19
Dependent Claim
65 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 applying a tape according to Claim 1 to said electrical apparatus at positions exposed to said gas stream.
Claim 20
Dependent Claim
33 words
A method according to claim 17 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 21
Dependent Claim
29 words
A method according to claim 17 including the additional last step of collecting a sample of said gas stream after a signal has been emitted and analyzing said sample.
Claim 22
Dependent Claim
44 words
A thermal detection system for electrical apparatus cooled by a gas stream, comprising a tape according to claim 1 on a portion of said electrical apparatus exposed to said gas stream and a monitor for detecting the presence of particles in said gas stream.
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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |