US3876496A
Expired / Lapsed
US
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Method and means for protecting documents
Assignee: Individual
•
Filing: 1973-05-14
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Granted: 1975-04-08
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Expires: 1993-05-14
Abstract
Abstract A safety paper composition is provided for protective documents in which a stabilized dye in the colloidal size range is dispersed. The dye which is substantially masked from view is sensitive to liquid ink eradicators such as bleach solutions and organic solvents in which the dye is soluble. A dye formulation is also provided, the dye being alcohol-soluble but which is stabilized with an alkaline agent, e.g., caustic soda, to render it water insensitive so that it can be easily dispersed together with either potassium iodide or manganese sulfate in a paper pulp slurry without dissolving away in the water and without coloring the paper to any substantial degree.
Inventors
- 👤 Ernesto B Lozano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:34
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/26; B41M1/36; D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/46; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
126 words
As an article of manufacture a safety paper composition characterized by a colloidal dispersion therethrough of a small but effective amount of an alcohol-soluble dye consisting essentially of Victoria Blue B stabilized with an alkaline agent selected from the group consisting of carbonates and hydroxides of ammonia and alkali metals, the paper also containing a small but effective amount of one of the reinforcing compounds potassium iodode and manganese sulfate such that the stabilized dye is uniformly masked and rendered water insensitive and such that when a selected portion of said paper is contacted by an ink eradicator selected from the group consisting of a bleaching agent and an organic solvent for said dye, the dye is caused permanently to strain said paper at said selected
Claim 2
Dependent Claim
126 words
As an article of manufacture a safety paper composition characterized by a colloidal dispersion therethrough of a small but effective amount of an alcohol-soluble dye consisting essentially of Victoria Blue B stabilized with an alkaline agent selected from the group consisting of carbonates and hydroxides of ammonia and alkali metals, the paper also containing a small but effective amount of one of the reinforcing compounds potassium iodode and manganese sulfate such that the stabilized dye is uniformly masked and rendered water insensitive and such that when a selected portion of said paper is contacted by an ink eradicator selected from the group consisting of a bleaching agent and an organic solvent for said dye, the dye is caused permanently to strain said paper at said selected
Claim 3
Dependent Claim
41 words
The safety paper of claim 1, wherein the average colloidal size of said stabilized dye ranges from about 0.01 to 0.2 micron and wherein the amount of dye in said paper ranges from about 0.02 to 0.5 percent by weight of
Claim 4
Dependent Claim
22 words
The safety paper of claim 2, wherein said dye is sodium hydroxide-stabilized and wherein the amount of dye in said paper ranges
Claim 5
Dependent Claim
47 words
The safety paper of claim 1, wherein said stabilized dye has an average colloidal size ranging from about 0.01 to 0.2.mu., wherein the amount of stabilized dye ranges by weight from about 0.02 to 0.5 percent, and wherein said reinforcing compound is potassium iodide ranging by weight
Claim 6
Dependent Claim
130 words
IN A METHOD OF PRODUCING SAFETY PAPER, THE IMPROVEMENT WHICH COMPRISES, UNIFORMLY DISPERSING THROUGH SAID PAPER A SMALL BUT EFFECTIVE AMOUNT OF A COLLOIDAL ALCOHOL-SOLUBLE DYE CONSISTING ESSENTIALLY OF VICTORIA BLUE B STABILIZED WITH AN ALKALINE AGENT SELECTED FROM THE GROUP CONSISTING OF CARBONARES AND HYDROXIDES OF AMMONIA AND ALKALI METALS, SAID PAPER ALSO HAVING ADDED THERETO A SMALL BUT EFFECTIVE AMOUNT OF ONE OF THE REINFORCING COMPOUNDS POTASSIUM IODIDE AND MANGANESE SULFATE SUCH THAT THE STABILIZED DYE IS UNIFORMLY MASKED AND RENDERED WATER INSENSITIVE AND SUCH THAT WHEN A SELECTED PORTION OF SAID PAPER IS CONTACTED BY AN INK ERADICATOR SELECTED FROM THE GROUP CONSISTING OF A BLEACHING AGENT AND AN ORGANIC SOLVENT FOR SAID DYE, THE DYE IS CAUSES PERMANENTLY TO STAIN SAID PAPER AT SAID SELECTED PORTION.
Claim 7
Dependent Claim
130 words
IN A METHOD OF PRODUCING SAFETY PAPER, THE IMPROVEMENT WHICH COMPRISES, UNIFORMLY DISPERSING THROUGH SAID PAPER A SMALL BUT EFFECTIVE AMOUNT OF A COLLOIDAL ALCOHOL-SOLUBLE DYE CONSISTING ESSENTIALLY OF VICTORIA BLUE B STABILIZED WITH AN ALKALINE AGENT SELECTED FROM THE GROUP CONSISTING OF CARBONARES AND HYDROXIDES OF AMMONIA AND ALKALI METALS, SAID PAPER ALSO HAVING ADDED THERETO A SMALL BUT EFFECTIVE AMOUNT OF ONE OF THE REINFORCING COMPOUNDS POTASSIUM IODIDE AND MANGANESE SULFATE SUCH THAT THE STABILIZED DYE IS UNIFORMLY MASKED AND RENDERED WATER INSENSITIVE AND SUCH THAT WHEN A SELECTED PORTION OF SAID PAPER IS CONTACTED BY AN INK ERADICATOR SELECTED FROM THE GROUP CONSISTING OF A BLEACHING AGENT AND AN ORGANIC SOLVENT FOR SAID DYE, THE DYE IS CAUSES PERMANENTLY TO STAIN SAID PAPER AT SAID SELECTED PORTION.
Claim 8
Dependent Claim
37 words
The method of claim 5, wherein the amount of dye dispersed in said paper ranges by weight from about 0.02 to 0.5 percent and wherein said reinforcing compound is potassium iodide ranging by weight from about 0.02
Claim 9
Independent Claim
205 words
A method of producing safety paper which comprises: preparing a dye formulation comprising an aqueous colloidal dispersion of about 0.5 to 5 percent by weight of an alcohol-soluble dye consisting essentially of Victoria Blue B stabilized with about 1 to 5 percent by weight of a dye-stabilizing alkaline agent selected from the group consisting of carbonates and hydroxides of ammonia and alkali metals, and the balance essentially water, the pH of said solution being over 9, preparing a paper pulp slurry, adding to said slurry in amount of said dye formulation such that the amount of Victoria Blue B dye in said slurry based upon the dry weight of said paper pulp ranges from about 0.02 to 0.5 percent, forming a paper product in the usual manner with a uniform dispersion of said stabilized colloidal dye therein, contacting said paper product with a solution containing 1 to 6 percent by weight of one of the reinforcing compounds potassium iodide and manganese sulfate, and then drying said paper, whereby a safety paper is provided such that when a selected portion of said paper is contacted with an ink eradicator selected from the group consisting of a bleaching agent and an organic solvent for said dye, a
Claim 10
Independent Claim
205 words
A method of producing safety paper which comprises: preparing a dye formulation comprising an aqueous colloidal dispersion of about 0.5 to 5 percent by weight of an alcohol-soluble dye consisting essentially of Victoria Blue B stabilized with about 1 to 5 percent by weight of a dye-stabilizing alkaline agent selected from the group consisting of carbonates and hydroxides of ammonia and alkali metals, and the balance essentially water, the pH of said solution being over 9, preparing a paper pulp slurry, adding to said slurry in amount of said dye formulation such that the amount of Victoria Blue B dye in said slurry based upon the dry weight of said paper pulp ranges from about 0.02 to 0.5 percent, forming a paper product in the usual manner with a uniform dispersion of said stabilized colloidal dye therein, contacting said paper product with a solution containing 1 to 6 percent by weight of one of the reinforcing compounds potassium iodide and manganese sulfate, and then drying said paper, whereby a safety paper is provided such that when a selected portion of said paper is contacted with an ink eradicator selected from the group consisting of a bleaching agent and an organic solvent for said dye, a
Claim 11
Dependent Claim
25 words
The method of claim 7, wherein said alkaline agent is sodium hydroxide and wherein said colloidal dye ranges in average size from about 0.01 to
Claim 12
Independent Claim
184 words
A method of producing safety paper which comprises: preparing a dye formulation comprising an aqueous colloidal dispersion of about 0.5 to 5 percent by weight of an alcohol-soluble dye consisting essentially of Victoria Blue B, about 1 to 5 percent by weight of a dye-stabilizing alkaline agent selected from the group consisting of carbonates and hydroxides selected from the group consisting of ammonia and alkali metals, and about 1 to 6 percent by weight of one of the reinforcing compounds potassium iodide and manganese sulfate dissolved therein, said aqueous dispersion having a pH of over 9, preparing a paper pulp slurry, forming a paper product from said slurry in the usual manner up to the finishing stage thereof including passing said paper product between heated rolls, uniformly contacting said paper product with said foregoing aqueous dispersion thereby absorbing said dispersion therein, and then drying said paper, whereby a safety paper is provided such that when a selected portion of said paper is contacted with an ink eradicator selected from the group consisting of a bleaching agent and an organic solvent for said dye, a
Claim 13
Independent Claim
184 words
A method of producing safety paper which comprises: preparing a dye formulation comprising an aqueous colloidal dispersion of about 0.5 to 5 percent by weight of an alcohol-soluble dye consisting essentially of Victoria Blue B, about 1 to 5 percent by weight of a dye-stabilizing alkaline agent selected from the group consisting of carbonates and hydroxides selected from the group consisting of ammonia and alkali metals, and about 1 to 6 percent by weight of one of the reinforcing compounds potassium iodide and manganese sulfate dissolved therein, said aqueous dispersion having a pH of over 9, preparing a paper pulp slurry, forming a paper product from said slurry in the usual manner up to the finishing stage thereof including passing said paper product between heated rolls, uniformly contacting said paper product with said foregoing aqueous dispersion thereby absorbing said dispersion therein, and then drying said paper, whereby a safety paper is provided such that when a selected portion of said paper is contacted with an ink eradicator selected from the group consisting of a bleaching agent and an organic solvent for said dye, a
Claim 14
Dependent Claim
67 words
The method of claim 9, wherein the alkaline agent is sodium hydroxide, wherein the aqueous dispersion has a pH of at least about 11 and contains by weight from about 1 to 3 percent Victoria Blue B, about 1 to 3 percent sodium hydroxide and about 1 to 3 percent potassium iodide, and wherein said colloidal dye has an average particle size ranging from about 0.01 to
Claim 15
Dependent Claim
138 words
A dye formulation for use in manufacturing safety paper which comprises: an aqueous dispersion of colloidal particles of an alcohol-soluble dye of Victoria Blue B in an amount ranging from about 0.5 to 5 percent by weight stabilized with about 1 to 5 percent by weight of a dye-stabilizing alkaline agent selected from the group consisting of carbonates and hydroxides of ammonia and alkali metals, and also containing dissolved therein about 1 to 6 percent by weight of one of the reinforcing compounds potassium iodide and manganese sulfate, and the balance essentially water, the pH of said aqueous dispersion being over 9, said formulation being characterized such that when said stabilized dye is uniformly dispersed in a paper product, the dye in the paper is masked until contacted by a liquid ink eradicator, whereby said dye causes a
Claim 16
Dependent Claim
138 words
A dye formulation for use in manufacturing safety paper which comprises: an aqueous dispersion of colloidal particles of an alcohol-soluble dye of Victoria Blue B in an amount ranging from about 0.5 to 5 percent by weight stabilized with about 1 to 5 percent by weight of a dye-stabilizing alkaline agent selected from the group consisting of carbonates and hydroxides of ammonia and alkali metals, and also containing dissolved therein about 1 to 6 percent by weight of one of the reinforcing compounds potassium iodide and manganese sulfate, and the balance essentially water, the pH of said aqueous dispersion being over 9, said formulation being characterized such that when said stabilized dye is uniformly dispersed in a paper product, the dye in the paper is masked until contacted by a liquid ink eradicator, whereby said dye causes a
Claim 17
Dependent Claim
123 words
A dye formulation for use in manufacturing safety paper which comprises: a dispersion of colloidal particles of an alcohol-soluble dye in an average size range of about 0.0l to 0.2 micron consisting essentially of Victoria Blue B in an amount ranging by weight from about 1 to 3 percent, about 1 to about 3 percent of sodium hydroxide, about 1 to 3 percent by weight of potassium iodide and the balance essentially water, the pH of said dispersion being at least about 11, said formulation being characterized such that when said stabilized dye is uniformly dispersed in a paper product, the dye in the paper is masked until contacted by a liquid ink eradicator, whereby said dye causes a permanent stain to appear.
Claim 18
Dependent Claim
123 words
A dye formulation for use in manufacturing safety paper which comprises: a dispersion of colloidal particles of an alcohol-soluble dye in an average size range of about 0.0l to 0.2 micron consisting essentially of Victoria Blue B in an amount ranging by weight from about 1 to 3 percent, about 1 to about 3 percent of sodium hydroxide, about 1 to 3 percent by weight of potassium iodide and the balance essentially water, the pH of said dispersion being at least about 11, said formulation being characterized such that when said stabilized dye is uniformly dispersed in a paper product, the dye in the paper is masked until contacted by a liquid ink eradicator, whereby said dye causes a permanent stain to appear.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |