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US4252845A
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Graphic arts ink and eradicator combination
Assignee: Chartpak Inc
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Filing: 1978-11-30
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Granted: 1981-02-24
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Expires: 1998-11-30
Abstract
Abstract An ink and eradicator system for use in the graphic arts comprising an ink containing a dye which is reducible to a colorless form in combination with a volatile acid and a non-volatile organic acid, dissolved to an aqueous solvent; and an ink eradicator containing a soluble sulfite or phosphite reducing agent and an aliphatic organic amine, dissolved in an aqueous solvent.
Inventors
- 👤 Kenneth G. Griffiths
- 👤 Arnel D. Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:02
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50; C09D10/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
An ink and eradicator system for use in the graphic arts which comprises: (a) an ink containing a dye which is reducible to a colorless form in combination with a volatile strong acid and a non-volatile organic acid, dissolved in an aqueous solvent, and (b) an ink eradicator containing a soluble sulfite or phosphite reducing agent and an aliphatic organic amine, dissolved in an aqueous solvent, said reducing agent capable of converting said dye of said ink to a colorless form when said ink eradicator is applied to said ink.
Claim 2
Dependent Claim
90 words
An ink and eradicator system for use in the graphic arts which comprises: (a) an ink containing a dye which is reducible to a colorless form in combination with a volatile strong acid and a non-volatile organic acid, dissolved in an aqueous solvent, and (b) an ink eradicator containing a soluble sulfite or phosphite reducing agent and an aliphatic organic amine, dissolved in an aqueous solvent, said reducing agent capable of converting said dye of said ink to a colorless form when said ink eradicator is applied to said ink.
Claim 3
Dependent Claim
46 words
An ink and eradicator system according to claim 1 wherein the ink contains about 1 to 5 parts by weight of dye, about 5 to 50 parts of said volatile acid and about 10 to 50 parts of said non-volatile acid per 1000 parts of water.
Claim 4
Dependent Claim
30 words
An ink and eradicator system according to claim 2 wherein the eradicator contains about 1 to 5% of said reducing agent and about 2 to 5% of said aliphatic amine.
Claim 5
Dependent Claim
16 words
An ink and eradicator system according to claim 2 wherein the dye is a triphenylmethane dye.
Claim 6
Dependent Claim
16 words
An ink and eradicator system according to claim 2 wherein the volatile acid is hydrochloric acid.
Claim 7
Dependent Claim
16 words
An ink and eradicator system according to claim 2 wherein the soluble sulfite is sodium sulfite.
Claim 8
Dependent Claim
15 words
An ink and eradicator system according to to claim 2 wherein the amine is morpholine.
Claim 9
Dependent Claim
97 words
Method of applying and removing graphic representations from paper which comprises applying thereto an ink containing a dye which is reducible to a colorless form in combination with a volatile strong acid and a non-volatile organic acid, dissolved in an aqueous solvent, and thereafter removing all or part of the graphic representations by applying thereto an ink eradicator comprising a soluble sulfite or phosphite reducing agent and an aliphatic organic amine, dissolved in an aqueous solvent, said reducing agent capable of converting said dye to a colorless form when said ink eradicator is applied to said ink.
Claim 10
Dependent Claim
97 words
Method of applying and removing graphic representations from paper which comprises applying thereto an ink containing a dye which is reducible to a colorless form in combination with a volatile strong acid and a non-volatile organic acid, dissolved in an aqueous solvent, and thereafter removing all or part of the graphic representations by applying thereto an ink eradicator comprising a soluble sulfite or phosphite reducing agent and an aliphatic organic amine, dissolved in an aqueous solvent, said reducing agent capable of converting said dye to a colorless form when said ink eradicator is applied to said ink.
References Cited (Backward Citations)
US1905118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |