US5580374A
Expired / Lapsed
US
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Aqueous ink composition for ball point pen
Assignee: Mitsubishi Pencil Co Ltd
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Filing: 1995-07-18
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Granted: 1996-12-03
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Expires: 2015-07-18
Abstract
Abstract An aqueous ink composition for ball point pens is disclosed herein which comprises 2,5-dimercapto-1,3,4-thiadiazole or its salt, a colorant, water and a water-soluble organic solvent. The aqueous ink composition for ball point pens of the present invention is excellent in lubricating properties, can control ball sinkage, and can give a smooth writing feeling.
Inventors
- 👤 Shigeru Okumura
- 👤 Shigeru Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:22
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
36 words
An aqueous ink composition for ball point pens which comprises 0.01 to 10% by weight of 2,5-dimercapto-1,3,4-thiadiazole or its salt based on the total weight of the composition, a colorant, water and a water-soluble organic solvent.
Claim 2
Dependent Claim
36 words
An aqueous ink composition for ball point pens which comprises 0.01 to 10% by weight of 2,5-dimercapto-1,3,4-thiadiazole or its salt based on the total weight of the composition, a colorant, water and a water-soluble organic solvent.
Claim 3
Dependent Claim
38 words
The aqueous ink composition for ball point pens according to claim 1 wherein the amount of 2,5-dimercapto-1,3,4-thiadiazole or its salt is in the range of 0.1 to 5% by weight based on the total weight of the composition.
Claim 4
Dependent Claim
58 words
The aqueous ink composition for ball point pens according to claim 1 wherein the amount of said colorant is 0.05 to 30% by weight, wherein the amount of water is 40 to 90% by weight and wherein the amount of water-soluble organic solvent is 40% or less by weight with respect to the total amount of the composition.
Claim 5
Dependent Claim
38 words
An aqueous ink composition for ball point pens which comprises 0.01 to 10% by weight of 2,5-dimercapto-1,3,4-thiadiazole or its salt based on the total weight of the composition, a pigment, a dispersant, water, and a water-soluble organic solvent.
Claim 6
Dependent Claim
38 words
An aqueous ink composition for ball point pens which comprises 0.01 to 10% by weight of 2,5-dimercapto-1,3,4-thiadiazole or its salt based on the total weight of the composition, a pigment, a dispersant, water, and a water-soluble organic solvent.
Claim 7
Dependent Claim
72 words
The aqueous ink composition for ball point pens according to claim 4 wherein the amount of said pigment is 2 to 30% by weight, wherein the amount of said dispersant is 0.1 to 10% by weight, wherein the amount of said water is 40 to 90% by weight and wherein the amount of said water-soluble organic solvent is 40% or less by weight with respect to the total amount of the composition.
Claim 8
Dependent Claim
19 words
The aqueous ink composition for ball point pens according to claim 4 wherein the dispersant is a water-soluble polymer.
Claim 9
Dependent Claim
46 words
An aqueous ink composition for ball point pens which comprises 0.01 to 10% by weight of 2,5-dimercapto-1,3,4-thiadiazole or its salt, 0.05 to 30% by weight of a dye, 40 to 90% by weight of water and 40% by weight or less of a water-soluble organic solvent.
Claim 10
Dependent Claim
46 words
An aqueous ink composition for ball point pens which comprises 0.01 to 10% by weight of 2,5-dimercapto-1,3,4-thiadiazole or its salt, 0.05 to 30% by weight of a dye, 40 to 90% by weight of water and 40% by weight or less of a water-soluble organic solvent.
Claim 11
Dependent Claim
20 words
The aqueous ink composition for ball point pens according to claim 5 wherein the dispersant is a water soluble polymer.
References Cited (Backward Citations)
JPS6258394A
Cited
US5169436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |