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US 4,156,657 AGranted
Ball point pen, ink and its eradicator system
AssigneeBurroughs Corporation
InventorAn-Chung R. Lin
Life of this patent
Estimating the term…
Abstract
Disclosed is a ball point ink pen, its ink and its eradicator. The ink is carried at one end of the pen and the eradicator portion is carried at the other. If an error is made, the pen can be reversed and the eradicator used to neutralize the ink. The ink also neutralizes the eradicator so that when one rewrites with the same ink, any remaining eradicator on the paper is neutralized and the original ink acts as fresh ink.
Claims9
An ink-eradicator system having a colored ink and its eradicator, said colored ink, which can be eradicated after application, comprising:
- a dye which remains colored in acid solution,
- a vehicle solution in which the dye will dissolve, and
- an acid with a PKa value smaller than 7, and said eradicator for said ink comprising,
- an amount of a base effective to neutralize the acid of said ink,
- an amount of an amine effective to act as a decolorizing agent for the dye to form a colorless product, and
- a hydroxy solvent,
- said ink being dye based and dissolved in said vehicle and acid solution, and the ink eradicator being formulated to neutralize the acid solution to permit said amine contained in solution as part of the eradicator to act as a decolorizing agent to form a colorless product upon application of the eradicator to ink which has been applied to paper, said ink being formulated to neutralize any excess eradicator when reapplied at the place on the paper that the previously applied ink has been eradicated such that reapplication of the same ink appears as fresh ink which remains visible.
4 more elements
An ink eradicator system substantially comprising:
- an ink and its Ph balanced eradicator;
- said ink consisting substantially of a dye which remains colored in acid solution;
- a vehicle in which said dye will dissolve;
- and
- an acid solution;
- and
- wherein said dye is a dye chosen from a group of dyes which reacts with the means to form colorless products, said group consisting of:
- diphenyl methane and triphenyl methane dyes and alkali blue dye;
- and
- wherein said vehicle is a glycol vehicle including at least one of a group of glycerine, diethylene glycol, and ethylene glycol;
- and
- wherein said acid solution consists substantially of an acid and hydroxy solvent, said acid being selected from a group consisting of citric acid, lactic acid, oxalic acid, acetic acid, benzoic acid, phthalic acid, Malonic acid, Succinic acid, Glutaric acid and other aliphatic, aromatic or inorganic acids having a PKa value below 7;
- and
- wherein said eradicator consists substantially of an amount of a base effected to neutralize said acid of said ink, and an amount of amine effected to act as a decolorizing agent for said dye of said ink to form a colorless product and a hydroxy solvent;
- and
- wherein said base of said eradicator is a hydroxide base selected from the group consisting of potassium hydroxide, and sodium hydroxide;
- and
- said amine is selected from a group of amines consisting of butyl amine, 3-methoxy propylamine, triethylene tetraamine, ethanol amine, morpholine, benzyl amine or other aliphatic-like primary amines which react with the dye to form a colorless product.
15 more elements
An ink eradicator system comprising:
- a ball point ink formulation and an eradicator formulation for said ink;
- said ball point pen ink consisting essentially in percentages by weight of plus or minus 15% of the following compositions:
- ______________________________________ Water 27.2% Glycerine 8.7% Citric Acid 38.0% Gum Arabic 13.0% Acid blue 22 13.1%;
- and ______________________________________
- said eradicator formulation consisting essentially in percentages by weight of plus or minus 15% of the following compositions:
- ______________________________________ Water 66.5% Ethanol 25.0% Ethanol amine 5.0% Potassium hydroxide 1.5% Triethylene tetraamine 2.0% ______________________________________
3 more elements
An ink eradicator system comprising:
- a ball point ink formulation and an eradicator formulation for said ink;
- said ball point pen ink consisting essentially in percentages by weight, of formulations selected from the group of:
- ______________________________________ I. Diethylene glycol 16.24% Water 11.62 Citric acid 23.18 Butoxy triglycol 13.05 Benzyl alcohol 9.09 Oleic acid 6.49 Emerez 1536 6.43 Acid Blue 22 13.90 II. Diethylene glycol 15.49% Water 10.99 Citric acid 22.04 PVP K-15 7.41 Dimethyl phthalate 6.17 Benzyl alcohol 24.69 Acid Blue 22 13.21 III. Ethylene glycol 10% Water 50 Tartaric acid 20 Hydroxy ethyl cellulose 5 WP-2 Acid Blue 22 15 IV. Glycerine 29.64% Water 42.58 Elvanol 3.92 Tartaric acid 4.71 Citric acid 4.71 Gallic acid 2.65 Acid Blue 22 11.79;
- and ______________________________________
- said eradicator consisting essentially in percentages by weight, of formulations selected from the group of:
- ______________________________________ Weight % ______________________________________ I. Potassium hydroxide 1.95 0.97% 3-Methoxy propyl amine 4.85 2.43 Ethanol amine 4.86 2.43 Glycerine 40.08 20.04 Water 148.25 74.13 II. Sodium hydroxide 0.36 0.72% Water 30.64 61.28 Ethanol 13.82 27.64 Gum Arabic 3.06 6.12 Ethanol amine 1.41 2.82 Triethylene tetraamine 0.71 1.42 III. Water 68 Methanol 25 Ethanol amine 5 Potassium hydroxide 2 IV. Water 93 Ethanol amine 5 Potassium hydroxide 2 ______________________________________
3 more elements
Dependencies are inferred from the claim text.