Patent US4954174A successfully refreshed from Google Patents.
US4954174A
Expired / Lapsed
US
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Erasable ink compositions
Assignee: Sakura Color Products Corp
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Filing: 1988-08-24
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Granted: 1990-09-04
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Expires: 2008-08-24
Abstract
Abstract An erasable ink composition for use in writing with a marking pen which comprises an organic solvent, optionally a resin soluble in the solvent, a pigment dispersed in the solvent and additives, the improvement in the additives comprising: (a) a fatty acid monoester of an aliphatic alcohol wherein the fatty acid has not less than six carbons in amounts of about 0.5-20% by weight; (b) a fatty acid triglyceride in amounts of about 0.5-20% by weight; (c) a higher aliphatic hydrocarbon which is liquid at normal temperatures is amounts of about 0.2-5% by weight; and (d) a polyoxyethylene alkyl ether phosphoric acid ester in amounts of about 0.5-7% by weight; each based on the ink composition. The writings with the ink composition is erasable even after a long standing.
Inventors
- 👤 Kiyotaka Imagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:36
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
An erasable ink composition for use in writing with a marking pen which comprises an organic solvent, optionally a resin soluble in the solvent, a pigment dispersed in the solvent and additives, the improvement in the additives comprising: (a) a fatty acid monoester of an aliphatic alcohol wherein the fatty acid has not less than six carbons in amounts of about 0.5-20% by weight; (b) a fatty acid triglyceride in amounts of about 0.5-20% by weight; (c) a higher aliphatic hydrocarbon which is liquid at normal temperatures in amounts of about 0.2-5% by weight; and (d) a polyoxyethylene alkyl ether phosphoric acid ester in amounts of about 0.5-7% by weight; each based on the ink composition.
Claim 2
Dependent Claim
116 words
An erasable ink composition for use in writing with a marking pen which comprises an organic solvent, optionally a resin soluble in the solvent, a pigment dispersed in the solvent and additives, the improvement in the additives comprising: (a) a fatty acid monoester of an aliphatic alcohol wherein the fatty acid has not less than six carbons in amounts of about 0.5-20% by weight; (b) a fatty acid triglyceride in amounts of about 0.5-20% by weight; (c) a higher aliphatic hydrocarbon which is liquid at normal temperatures in amounts of about 0.2-5% by weight; and (d) a polyoxyethylene alkyl ether phosphoric acid ester in amounts of about 0.5-7% by weight; each based on the ink composition.
Claim 3
Dependent Claim
23 words
The ink composition as claimed in claim 1 wherein the alcohol component in the fatty acid monoester has not less than two carbons.
Claim 4
Dependent Claim
23 words
The ink composition as claimed in claim 1 wherein the alcohol component in the fatty acid monoester has not less than four carbons.
Claim 5
Dependent Claim
22 words
The ink composition as claimed in claim 1 wherein the fatty acid component in the triglyceride has not less than six carbons.
Claim 6
Dependent Claim
22 words
The ink composition as claimed in claim 1 wherein the fatty acid component in the triglyceride has not less than eight carbons.
Claim 7
Dependent Claim
16 words
The ink composition as claimed in claim 1 wherein the higher aliphatic hydrocarbon is liquid paraffin.
Claim 8
Dependent Claim
21 words
The ink composition as claimed in claim 1 wherein the solvent is an alcohol, a cellosolve or a mixture of these.
References Cited (Backward Citations)
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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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |