Patent US3834823A successfully refreshed from Google Patents.
US3834823A
Expired / Lapsed
US
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Marking boards and erasable ink compositions therefor
Assignee: Gillette Co LLC
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Filing: 1972-05-25
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Granted: 1974-09-10
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Expires: 1992-05-25
Abstract
Abstract An ink composition for writing instruments having a porous writing point, which will write satisfactorily on relatively smooth, hard surfaces (e.g., solid plastic surfaces) and which can easily be erased from said smooth, hard surfaces by merely wiping with a dry cloth or paper tissue. The ink composition contains, as essential ingredients, water, a water soluble dye, a silicone surfactant, and a release agent in which the water soluble dye is insoluble. The ink composition may also contain a wax to prevent dusting. An erasing system including a marking board having a smooth, hard, non-porous surface of plastic and a porous point pen having an ink therein which will deposit uniform, legible traces, markings or lines on said plastic surface and which can be removed therefrom with a dry cloth or paper tissue.
Inventors
- 👤 D Seregely
- 👤 B Kidda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:07
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
28 words
An ink solution according to claim 1 wherein the release agent is present in an amount of from 0.1% to 5%, by weight, based on the entire solution.
Claim 2
Dependent Claim
24 words
An ink solution according to claim 1 wherein the ink solution contains a solid water-soluble wax, the water-soluble dye being soluble in such wax.
Claim 3
Dependent Claim
20 words
An ink solution according to claim 3 wherein the water-soluble wax has an HLB rating of from 15 to 20.
Claim 4
Dependent Claim
48 words
An ink solution according to claim 3 wherein the wax is a member selected from the group consisting of an aliphatic ether of polyoxyalkylene, the alkylene group having two to four carbon atoms, and aromatic ether of polyoxyalkylene, the alkylene group having from two to four carbon atoms.
Claim 5
Dependent Claim
17 words
An ink solution according to claim 1 wherein the liquid organic silicone surface active agent is nonionic.
Claim 6
Dependent Claim
17 words
An ink solution according to claim 1 wherein the water soluble organic solvent is lower alkyl alcohol.
Claim 7
Dependent Claim
24 words
An ink solution according to claim 1 wherein the release agent is an ester of carboxylic acid having a molecular weight greater than 100.
Claim 8
Dependent Claim
23 words
An ink solution according to claim 6 wherein the liquid organic silicone surface active agent has an HLB rating of at least 10.
Claim 9
Dependent Claim
14 words
An ink solution according to claim 1 wherein the release agent is polypropylene glycol.
Claim 10
Dependent Claim
268 words
In a writing instrument having an ink reservoir and a porous synthetic fiber tip, the fibers bounded together to provide a multiplicity of chanNels, and an ink composition contained in said reservoir, the improvement wherein said ink solution will form continuous, unbroken lines during prolonged writing with such tip on a smooth, virtually non-porous plastic surface, said lines being easily erased from said plastic surface after drying by a dry eraser, said ink being a solution and having a viscosity at 25*C. of between 2 and 10 centipoises and having a surface tension less than about 40 dynes/cm. at 25*C and consisting essentially of an aqueous solvent containing from 50% to 100% by weight of water and from 0% to 50% by weight of a water-soluble organic solvent having an eveporation rate greater than 0.1, at 25*C., using butyl acetate at 1.0 as the basis; a liquid organic silicone surface active agent which is soluble in the ink composition and having an HLB value of at least 10 and in an amount of from 0.5% to 5%, by weight, based on the weight of the entire ink solution; a liquid release agent which is soluble in the aqueous solvent and is substantially colorless and has low toxicity and a vapor pressure of less than 0.01 mm. of mercury at 25*C., said liquid release agent being selected from the group consisting of polyester, polyether, ester of carboxylic acid having a molecular weight greater than 100, and an aliphatic glycol having at least six carbon atoms and a minor amount of water-soluble dye which is insoluble in the release agent.
Claim 11
Dependent Claim
20 words
A writing instrument according to claim 11 wherein the amount of release agent is between 0.1% and 5%, by weight.
Claim 12
Dependent Claim
21 words
A writing instrument according to claim 11 wherein the ink contains a water-soluble wax in which said water-soluble dye is soluble.
Claim 13
Dependent Claim
26 words
A writing instrument according to claim 11 wherein the liquid organic silicone surface active agent is nonionic and has an HLB rating of at least 10.
Claim 14
Dependent Claim
14 words
A writing instrument according to claim 11 wherein the release agent is polypropylene glycol.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |