US4412936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigment for color-changing heat indicator
Assignee: ALMALYXKY GORNO-METALLURGICHESKY KOMBINAT 702400 ALMALYK TASHKENTSKOI OBLASTI
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Filing: 1981-05-07
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Granted: 1983-11-01
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Expires: 2001-05-07
Abstract
Abstract A pigment for a color-changing heat indicator comprising a product obtained by interaction of an aqueous solution containing ions of copper and mercury with an aqueous solution of a nitrogen-containing organic compound: an amide of carbonic acid, an amide of thiocarbonic acid, a tertiary amine to give a reaction mixture which is reacted with an aqueous solution containing ions of iodine at an atomic ratio of copper:mercury:iodine equal to 2:1.5:3-5 and an amount of the nitrogen-containing organic compound equal to 0.8-8% of the total content of copper and mercury; the pigment has its critical temperature of from 38° to 70° C. and a heat-resistance of from 160° to 180° C.
Inventors
- 👤 Stanislav F. Khmelkov
- 👤 Mnaidar R. Ramazanov
- 👤 Mikhail P. Soldatov
- 👤 Vadim V. Beskaravainy
- 👤 Viktor L. Aranovich
- 👤 Lev K. Soldaev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:28
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01K11/14; C; C09; C09D; C09D5/00; C09D5/26; Y; Y10; Y10S; Y10S252/00; Y10S252/962
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
A method of producing a pigment for a color-changing heat indicator which comprises: (a) mixing an aqueous solution containing ions of bivalent copper and mercury with an aqueous solution of a nitrogen containing compound selected from the group consisting of an amide of carbonic or thiocarbonic acid, and a tertiary amine in an amount equal to 0.8-8.0% of the total content of copper and mercury, and (b) adding to the resulting mixture, an aqueous solution containing iodine ions to thereby form a pigment wherein the atomic ratio of Cu:Hg:I in said pigment is 2:1.5:3-5.
Claim 2
Independent Claim
94 words
A method of producing a pigment for a color-changing heat indicator which comprises: (a) mixing an aqueous solution containing ions of bivalent copper and mercury with an aqueous solution of a nitrogen containing compound selected from the group consisting of an amide of carbonic or thiocarbonic acid, and a tertiary amine in an amount equal to 0.8-8.0% of the total content of copper and mercury, and (b) adding to the resulting mixture, an aqueous solution containing iodine ions to thereby form a pigment wherein the atomic ratio of Cu:Hg:I in said pigment is 2:1.5:3-5.
Claim 3
Dependent Claim
20 words
The method according to claim 1, further comprising drying said pigment to a moisture content of between 2 and 4%.
Claim 4
Dependent Claim
21 words
The method according to claim 1 wherein said carbonic acid amide is selected from the group consisting of urea and thiourea.
Claim 5
Dependent Claim
12 words
The method according to claim 1 wherein said tertiary amine is hexamethylenetetramine.
Claim 6
Dependent Claim
13 words
The method according to claim 3, wherein the carbonic acid amide is urea.
Claim 7
Dependent Claim
13 words
The method according to claim 3, wherein the carbonic acid amide is thiourea.
Claim 8
Dependent Claim
15 words
The product produced by the process of claims 1, 2, 3, 4, 5 or 6.
References Cited (Backward Citations)
SU352922A1
Cited
US3219993A
Cited
DE2611602A1
Cited
SU735620A1
Cited
JPS5370931A
Cited
JPS54138546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |