Patent US4030934A successfully refreshed from Google Patents.
US4030934A
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Coloring composition for line- or pattern- drawing elements
Assignee: Kawamura Seichu Kogyo KK
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Filing: 1975-04-24
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Granted: 1977-06-21
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Expires: 1995-04-24
Abstract
Abstract A coloring composition for line- or pattern-drawing elements which comprises as a base material thereof one or more acidic sublimating substances such as benzoic acid, salicylic acid and phthalic acid. Lines and/or patterns drawn with the coloring composition are easily erased by heating.
Inventors
- 👤 Zenshiro IIjima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:55
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50; C09D5/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A heat-erasable coloring composition for line-or pattern-drawing elements which comprises at least one acidic sublimating substance selected from the group consisting of benzoic acid salicylic acid, phthalic anhydride, maleic anhydride and mixtures thereof, having dispersed thereinto a coloring agent present in an amount 0.001-0.1 parts by weight per part of acidic sublimating substance, said coloring agent being capable of developing its color under acidic conditions and being selected from the group consisting rhodamine lactone and crystal violet lactone.
Claim 2
Dependent Claim
78 words
A heat-erasable coloring composition for line-or pattern-drawing elements which comprises at least one acidic sublimating substance selected from the group consisting of benzoic acid salicylic acid, phthalic anhydride, maleic anhydride and mixtures thereof, having dispersed thereinto a coloring agent present in an amount 0.001-0.1 parts by weight per part of acidic sublimating substance, said coloring agent being capable of developing its color under acidic conditions and being selected from the group consisting rhodamine lactone and crystal violet lactone.
Claim 3
Dependent Claim
51 words
A composition according to claim 1, additionally comprising a metal salt of a higher fatty acid selected from the group consisting of calcium stearate and calcium oleate in an amount of 0.01-0.5 parts by weight per part of acidic sublimating substance to increase the sublimation rate of said acidic sublimating substance.
Claim 4
Dependent Claim
18 words
A composition according to claim 2, wherein said metal salt of a higher fatty acid is calcium stearate.
Claim 5
Dependent Claim
22 words
A composition according to claim 1, wherein said acidic sublimating substance is a mixture of benzoic acid, salicylic acid and phthalic anhydride.
Claim 6
Dependent Claim
26 words
A composition according to claim 1, wherein gum arabic is added in an amount of 0.01-0.5 parts by weight per part of said acidic sublimating substance.
Claim 7
Dependent Claim
80 words
A heat-erasable coloring composition for line-or pattern-drawing elements which comprises at least one acidic sublimating substance selected from the group consisting of benzoic acid, salicylic acid, phthalic anhydride, maleic anhydride and mixtures thereof, having dispersed thereinto a metal salt of a higher fatty acid selected from the group consisting of calcium stearate and calcium oleate in an amount of 0.01-0.5 parts by weight per part of said acidic sublimating substance to increase the sublimating rate of said acidic sublimating substance.
Claim 8
Dependent Claim
80 words
A heat-erasable coloring composition for line-or pattern-drawing elements which comprises at least one acidic sublimating substance selected from the group consisting of benzoic acid, salicylic acid, phthalic anhydride, maleic anhydride and mixtures thereof, having dispersed thereinto a metal salt of a higher fatty acid selected from the group consisting of calcium stearate and calcium oleate in an amount of 0.01-0.5 parts by weight per part of said acidic sublimating substance to increase the sublimating rate of said acidic sublimating substance.
Claim 9
Dependent Claim
34 words
A composition according to claim 6, wherein said acidic sublimating substance comprises a mixture of 1 part by weight of salicylic acid, 0.1-1 part weight benzoic acid and 0.1-1 part by weight phthalic anhydride.
Claim 10
Dependent Claim
25 words
A composition according to claim 6, wherein gum arabic is added in an amount 0.01-0.5 parts by weight per part of said acidic sublimating substance.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |