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US4101329A
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Aqueous ink for an ink ejection process
Assignee: Olympia Werke AG
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Filing: 1976-03-16
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Granted: 1978-07-18
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Expires: 1996-03-16
Abstract
Abstract An aqueous ink for an ink ejection process, particularly a blue ink for a process employing an ejection system which produces droplets, comprises (a) a water soluble triphenyl methane dye and (b) a buffer mixture of at least one organic hydroxy-containing carboxylic acid and at least one water soluble amine.
Inventors
- 👤 Ehrenfried Loock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:29
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
An aqueous ink for an ink ejection process comprises: (a) a water soluble triphenyl methane dye and (b) a buffer mixture of 5 to 200 g/l of ink of at least one organic hydroxy-containing carboxylic acid selected from the group consisting of citric acid, malic acid, gluconic acid and tartaric acid and 5 to 200 g/l of ink of at least one water soluble amine selected from the group consisting of diethanolamine, ethanolamine, ethylenediamine and triethanolamine.
Claim 2
Dependent Claim
76 words
An aqueous ink for an ink ejection process comprises: (a) a water soluble triphenyl methane dye and (b) a buffer mixture of 5 to 200 g/l of ink of at least one organic hydroxy-containing carboxylic acid selected from the group consisting of citric acid, malic acid, gluconic acid and tartaric acid and 5 to 200 g/l of ink of at least one water soluble amine selected from the group consisting of diethanolamine, ethanolamine, ethylenediamine and triethanolamine.
Claim 3
Dependent Claim
28 words
The aqueous ink as defined in claim 1, wherein the buffer mixture comprises citric acid and triethanolamine which sets the ink to a pH of 4 to 5.
Claim 4
Dependent Claim
20 words
The aqueous ink as defined in claim 1, wherein the ink contains 0.2 to 0.5% by weight of polyethylene glycol.
Claim 5
Dependent Claim
18 words
The aqueous ink as defined in claim 1, wherein the dye is one that produces a blue ink.
Claim 6
Dependent Claim
33 words
The aqueous ink as defined in claim 1, wherein the buffer mixture contains 20 to 50 g/l of ink of said carboxylic acid and 20 to 50 g/l of ink of said amine.
Claim 7
Dependent Claim
22 words
The aqueous ink as defined in claim 1, wherein the buffer mixture sets the ink to a pH of 4 to 5.
Claim 8
Dependent Claim
20 words
The aqeuous ink as defined in claim 5, wherein the ink contains 0.2 to 0.5% by weight of polyethylene glycol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |