US4424990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermochromic compositions
Assignee: Raychem Corp
•
Filing: 1981-11-25
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Granted: 1984-01-10
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Expires: 2001-11-25
Abstract
Abstract This invention provides novel thermochromic compositions which exhibit distinct color changes at temperatures in the range of about 165° C. to about 240° C. The compositions comprise basic copper carbonate and a sulfur compound. Paint formulations containing these novel thermochromic compositions or complexes of copper and sulfur-containing organic acids are also provided. The compositions are useful with heat-recoverable memory metal couplings to prevent overheating of the couplings during installation.
Inventors
- 👤 Lawrence J. White
- 👤 Tamar G. Gen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:00
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; C; C09; C09D; C09D5/00; C09D5/26; G01K11/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865; Y10T29/4987; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T403/00; Y10T403/48; Y10T403/49; Y10T403/4933
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
37 words
A thermochromic composition comprising a mixture of basic copper carbonate and a sulfur-containing organic acid; said composition undergoing a distinct change of color at temperatures in the range of from about 165° C. to about 240° C.
Claim 2
Dependent Claim
37 words
A thermochromic composition comprising a mixture of basic copper carbonate and a sulfur-containing organic acid; said composition undergoing a distinct change of color at temperatures in the range of from about 165° C. to about 240° C.
Claim 3
Dependent Claim
17 words
A composition in accordance with claim 1 wherein said sulfur-containing organic acid is a sulfur-containing organic diacid.
Claim 4
Dependent Claim
18 words
A composition in accordance with claim 2 wherein said sulfur-containing organic diacid is a sulfur containing aliphatic diacid.
Claim 5
Dependent Claim
15 words
A composition in accordance with claim 3 wherein said sulfur-containing aliphatic diacid is 3,3'-thiodipropionic acid.
Claim 6
Dependent Claim
29 words
A thermochromic composition in accordance with claim 1 wherein the mole ratio of said basic copper carbonate to said sulfur-containing organic acid is from about 0.5:1 to about 2:1.
Claim 7
Dependent Claim
13 words
A composition in accordance with claim 5 wherein said mole ratio is 1:1.
Claim 8
Dependent Claim
28 words
A composition in accordance with claim 1 wherein said distinct change of color occurs at temperatures in the range of from about 190° C. to about 240° C.
Claim 9
Dependent Claim
25 words
A thermochromic paint composition comprising a liquid paint formulation having dispersed therein a thermochromic component comprising a complex of copper and a sulfur-containing organic acid.
Claim 10
Dependent Claim
25 words
A thermochromic paint composition comprising a liquid paint formulation having dispersed therein a thermochromic component comprising a complex of copper and a sulfur-containing organic acid.
Claim 11
Dependent Claim
18 words
A paint composition in accordance with claim 8 wherein said sulfur-containing organic acid is a sulfur-containing aliphatic acid.
Claim 12
Dependent Claim
20 words
A paint composition in accordance with claim 8 wherein said thermochromic component is a complex of copper and 3,3'-thiodipropionic acid.
Claim 13
Dependent Claim
21 words
A paint composition in accordance with claim 10 wherein said complex is formed by reacting basic copper carbonate and 3,3'-thiodipropionic acid.
Claim 14
Dependent Claim
23 words
A paint composition in accordance with claim 8 wherein said liquid paint formulation comprises an organic solvent having binder dissolved or dispersed therein.
Claim 15
Dependent Claim
16 words
A paint composition in accordance with claim 12 wherein said binder is an ethylene-vinyl acetate copolymer.
Claim 16
Dependent Claim
75 words
A coupling which comprises a hollow cylindrical heat-recoverable memory metal member, a liner inserted in said heat-recoverable member in intimate contact therewith, a sealant coated on the interior surface of said liner and a thermochromic paint composition applied to at least a portion of the exposed surface of the coupling, said thermochromic paint composition comprising a liquid paint formulation having dispersed therein a thermochromic component comprising a complex of copper and a sulfur-containing organic acid.
Claim 17
Dependent Claim
75 words
A coupling which comprises a hollow cylindrical heat-recoverable memory metal member, a liner inserted in said heat-recoverable member in intimate contact therewith, a sealant coated on the interior surface of said liner and a thermochromic paint composition applied to at least a portion of the exposed surface of the coupling, said thermochromic paint composition comprising a liquid paint formulation having dispersed therein a thermochromic component comprising a complex of copper and a sulfur-containing organic acid.
Claim 18
Dependent Claim
29 words
A coupling in accordance with claim 14 wherein said thermochromic paint composition comprises a liquid paint formulation having dispersed therein a complex of copper and a sulfur-containing organic diacid.
Claim 19
Dependent Claim
18 words
A coupling in accordance with claim 15 wherein said complex is a complex of copper and 3,3'-thiodipropionic acid.
Claim 20
Dependent Claim
20 words
A coupling in accordance with claim 16 wherein said complex is formed by reacting basic copper carbonate and 3,3'-thiodipropionic acid.
Claim 21
Dependent Claim
47 words
A coupling in accordance with claim 14 wherein said heat-recoverable memory metal member is of β-brass, said liner is of aluminum, said sealant is an epoxy resin, and said thermochromic paint composition comprises a liquid paint formulation having dispersed therein a complex of copper and 3,3'-thiodipropionic acid.
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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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |