US4368076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink composition
Assignee: Adger Kogyo Co Ltd
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Filing: 1979-01-06
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Granted: 1983-01-11
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Expires: 1999-01-06
Abstract
Abstract An ink composition which comprises a solution of cobalt thiocyanate or a mixture of a compound capable of producing a thiocyanate ion and a compound capable of producing a cobalt ion in a liquid vehicle, the solution having been incorporated with polyalkylene glycol. This ink composition can give vivid inking images of deep blue color, which images can be erased, if necessary, by wiping with cloth, paper, fibrous material or the like impregnated with water.
Inventors
- 👤 Zenshiro IIjima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:08
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/17
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
27 words
An ink composition comprising: a liquid vehicle including water; a source of cobalt ion and thiocyanate ion; and a polyalkylene glycol having a molecular weight of 100-1000.
Claim 2
Dependent Claim
27 words
An ink composition comprising: a liquid vehicle including water; a source of cobalt ion and thiocyanate ion; and a polyalkylene glycol having a molecular weight of 100-1000.
Claim 3
Dependent Claim
25 words
The ink composition according to claim 1, wherein said polyalkylene glycol is selected from the group consisting of polyethylene glycol, polypropylene glycol and copolymers thereof.
Claim 4
Dependent Claim
31 words
The ink composition according to claim 1, wherein the liquid vehicle further includes a material selected from the group consisting of methanol, ethanol, acetone, chloroform, ethyl acetate or a mixture thereof.
Claim 5
Dependent Claim
22 words
The ink composition according to claim 1, further comprising a thickening agent selected from the group consisting of starch, carboxymethylcellulose and gelatin.
Claim 6
Dependent Claim
35 words
The ink composition according to claim 1, wherein said cobalt ion- and thiocyanate ion-source includes cobalt thiocyanate, the concentration of the cobalt thiocyanate in said liquid vehicle being not greater than 30 percent by weight.
Claim 7
Dependent Claim
65 words
The ink composition according to claim 1, wherein said cobalt ion- and thiocyanate ion-source includes a mixture of a compound capable of producing cobalt ion and a compound capable of producing thiocyanate ion, the concentration of said mixture in said liquid vehicle being such that the concentration of cobalt thiocyanate formed in situ is not greater than 30 percent by weight in said liquid vehicle.
Claim 8
Dependent Claim
29 words
The ink composition according to claim 6, wherein said compound capable of producing cobalt ion is cobalt chloride and said compound capable of producing thiocyanate ion is nickel thiocyanate.
Claim 9
Dependent Claim
29 words
The ink composition according to claim 5, wherein said polyalkylene glycol is used in an amount of 0.2-2.5 parts by weight per part by weight of said cobalt thiocyanate.
Claim 10
Dependent Claim
56 words
The ink composition according to claim 7, wherein the concentrations of said nickel thiocyanate and said cobalt chloride in said liquid vehicle are 0.5-15 percent by weight and 1-15 percent by weight, respectively, and wherein said cobalt chloride is used in an amount of 0.1-3 parts by weight per part by weight of said nickel thiocyanate.
Claim 11
Dependent Claim
29 words
The ink composition according to claim 7, wherein said polyalkylene glycol is used in an amount of 0.5-7 parts by weight per part by weight of said nickel thiocyanate.
Claim 12
Dependent Claim
25 words
The ink composition according to claim 1,8 or 10, wherein the concentration of said polyalkylene glycol in said liquid vehicle is 1-30 percent by weight.
Claim 13
Dependent Claim
17 words
The ink composition according to claim 2, wherein said polyalkylene glycol has a molecular weight of 200-300.
Claim 14
Dependent Claim
53 words
An ink composition having moderate viscosity consisting essentially of a source of cobalt ion and a source of thiocyanate ion having a concentration of less than 30 percent, a liquid vehicle including water, and a polyalkylene glycol as a color intensifier, said polyalkylene glycol having a molecular weight of about 100 to 1000.
Claim 15
Dependent Claim
53 words
An ink composition having moderate viscosity consisting essentially of a source of cobalt ion and a source of thiocyanate ion having a concentration of less than 30 percent, a liquid vehicle including water, and a polyalkylene glycol as a color intensifier, said polyalkylene glycol having a molecular weight of about 100 to 1000.
References Cited (Backward Citations)
US4014833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |