US4070912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature indicating compositions and devices
Assignee: Individual
•
Filing: 1975-10-01
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Granted: 1978-01-31
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Expires: 1995-10-01
Abstract
Abstract Polymeric mixtures of a cholesterol material and a monomer are disclosed which can advantageously be utilized for the construction of temperature indicating devices. Each polymeric composition exhibits a color at temperatures below a fixed threshold temperature and then appears colorless at the threshold temperature. This characteristic permits safe, compact, accurate, fast responsive, disposable temperature indicating and warning devices to be made.
Inventors
- 👤 Thomas J. McNaughtan, deceased
- 👤 executor by Jerry McClintock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:02
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/36; C09D; C09D5/00; C09D5/26; C09K19/52; C09K19/54; G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; G01K11/165; G01K13/00; G01K13/20; C09K2323/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
A printable composition comprising a polymeric material dissolved in petroleum ether, said polymeric material being formed by heating a cholesteryl ester material comprising cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol at a temperature of 150° C until no further acetic acid is formed and the oily liquid changes to a solid.
Claim 2
Dependent Claim
56 words
A printable composition comprising a polymeric material dissolved in petroleum ether, said polymeric material being formed by heating a cholesteryl ester material comprising cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol at a temperature of 150° C until no further acetic acid is formed and the oily liquid changes to a solid.
Claim 3
Dependent Claim
24 words
The printable composition of claim 1 in which cholesteryl propionate is added to the cholesteryl acetate prior to the formation of the polymeric material.
Claim 4
Dependent Claim
76 words
A temperature indicating device comprising temperature sensitive materials applied to a substrate to form a plurality of markings thereon, each marking having a different temperature sensitivity, said temperature sensitive materials being formed by heating cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol in the presence of varying amounts of cholesteryl propionate at a temperature of 150° C until no further acetic acid is formed and the oily liquid changes to a solid.
Claim 5
Dependent Claim
76 words
A temperature indicating device comprising temperature sensitive materials applied to a substrate to form a plurality of markings thereon, each marking having a different temperature sensitivity, said temperature sensitive materials being formed by heating cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol in the presence of varying amounts of cholesteryl propionate at a temperature of 150° C until no further acetic acid is formed and the oily liquid changes to a solid.
Claim 6
Dependent Claim
34 words
The temperature indicating device of claim 3 wherein the substrate is polyvinyl chloride and wherein a protective layer of substantially transparent plastic film covers the temperature sensitive materials which are applied to the substrate.
Claim 7
Dependent Claim
113 words
The process of preparing a temperature sensitive device comprising a substrate, a temperature sensitive composition applied to at least one surface of the substrate and a transparent protective covering over the temperature sensitive composition, which process comprises preparing a printable composition comprising a polymeric material dissolved in petroleum ether wherein said polymeric material is formed by heating a cholesteryl ester material comprising cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol at a temperature of 150° C until no further acetic acid is formed and the oily liquid changes to a solid, applying the printable composition to the substrate and covering the temperature sensitive composition with a transparent protective coating.
Claim 8
Dependent Claim
113 words
The process of preparing a temperature sensitive device comprising a substrate, a temperature sensitive composition applied to at least one surface of the substrate and a transparent protective covering over the temperature sensitive composition, which process comprises preparing a printable composition comprising a polymeric material dissolved in petroleum ether wherein said polymeric material is formed by heating a cholesteryl ester material comprising cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol at a temperature of 150° C until no further acetic acid is formed and the oily liquid changes to a solid, applying the printable composition to the substrate and covering the temperature sensitive composition with a transparent protective coating.
Claim 9
Dependent Claim
23 words
The process of claim 5 in which cholesteryl propionate is added to the cholesteryl acetate prior to the formation of the polymeric material.
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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) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |