US4256492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marker ink for writing board
Assignee: Matsumoto Textile and Chemical Consultants Co
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Filing: 1978-12-12
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Granted: 1981-03-17
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Expires: 1998-12-12
Abstract
Abstract A colored marker ink for use on a writing board is manufactured by blending a colorant, a resin and a mixed solvent consisting of a good solvent for the resin possessing a high speed of vaporization and a non-solvent for the resin possessing a lower speed of vaporization than that of the good solvent. When a letter or figure is written on the board with this marker ink, the resin component of the ink thus applied to the board gels into opaque lines in the shape of the letter or figure in consequence of gradual vaporization of the good solvent.
Inventors
- 👤 Kenji Matsumoto
- 👤 Shintaro Hishikawa
- 👤 Yoshikatsu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:04
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A colored marker ink for use on a writing board and capable of forming opaque marker traces on the board, which consists essentially of: a uniformly blended mixture of a colorant, a resin and a mixed solvent consisting of at least one solvent for the resin selected from the group consisting of acetone, methylethyl ketone, methyl acetate, ethyl acetate, methanol, ethanol and nitro methane and at least one non-solvent for the resin selected from the group consisting of n-butanol, iso-propyl alcohol, toluol, xylol and n-butyl acetate, the mixing ratio of the solvent to the nonsolvent being within the range from 70:30 to 60:40.
Claim 2
Dependent Claim
103 words
A colored marker ink for use on a writing board and capable of forming opaque marker traces on the board, which consists essentially of: a uniformly blended mixture of a colorant, a resin and a mixed solvent consisting of at least one solvent for the resin selected from the group consisting of acetone, methylethyl ketone, methyl acetate, ethyl acetate, methanol, ethanol and nitro methane and at least one non-solvent for the resin selected from the group consisting of n-butanol, iso-propyl alcohol, toluol, xylol and n-butyl acetate, the mixing ratio of the solvent to the nonsolvent being within the range from 70:30 to 60:40.
Claim 3
Dependent Claim
25 words
The colored marker ink according to claim 1, wherein the colorant is at least one member selected from the group consisting of dyes and pigments.
Claim 4
Dependent Claim
35 words
The colored marker ink according to claim 1, wherein the resin is at least one member selected from the group consisting of nitrocellulose, cellulose acetate, ethyl cellulose, cellulose acetate butyrate, and vinyl chloride-vinyl acetate copolymers.
Claim 5
Dependent Claim
20 words
The colored marker ink according to claim 2, wherein the dye possesses affinity for the resin used in the ink.
Claim 6
Dependent Claim
24 words
The colored marker ink according to claim 1, wherein the resin is fast dyed with the colorant before being blended with the mixed solvent.
Claim 7
Dependent Claim
22 words
The colored marker ink according to claim 5, wherein the mixed solvent possesses poor solubility to the colorant used in the ink.
Claim 8
Dependent Claim
27 words
The colored marker ink according to claim 1, wherein the resin is kneaded with a pigment selected as the colorant before being blended with the mixed solvent.
Claim 9
Dependent Claim
16 words
The colored marker ink according to claim 1, wherein the solvent for the resin is hydrophilic.
Claim 10
Dependent Claim
16 words
The colored marker ink according to claim 1, wherein the non-solvent for the resin is hydrophobic.
Claim 11
Dependent Claim
19 words
The colored marker ink according to claim 1, wherein the ink solvent system contains a small amount of water.
Claim 12
Dependent Claim
34 words
The colored marker ink according to claim 1, wherein said at least one solvent and said at least one non-solvent are mixed and said colorant and said resin are dissolved in said solvent mixture.
References Cited (Backward Citations)
US2343781A
Cited
US2991184A
Cited
US3280036A
Cited
US3486912A
Cited
GB1311154A
Cited
US4042545A
Cited
US4070322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |