US4142905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waterless ink for non-impact jet printers
Assignee: Unisys Corp
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Filing: 1977-09-09
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Granted: 1979-03-06
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Expires: 1997-09-09
Abstract
Abstract Disclosed is a new method of using an ink in an ink jet printer and the ink utilized thereby. It has been found that ethylene glycol is a suitable vehicle, provided an inorganic salt dissolved in the glycol to provide a required level of electrical conductivity is utilized, and in which should be dissolved dyes for coloration.
Inventors
- 👤 Theodore M. Cooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A waterless ink for a non-impact jet printer consisting essentially of: 89% to 93% by weight of a low molecular weight glycol having a liquid phase within the range of 35° C. to 70° C. and at operating temperatures of the non-impact jet printer, and between 3-6% by weight of an inorganic salt electrolyte and between 3-6% by weight of a dye which is soluble in the glycol.
Claim 2
Dependent Claim
68 words
A waterless ink for a non-impact jet printer consisting essentially of: 89% to 93% by weight of a low molecular weight glycol having a liquid phase within the range of 35° C. to 70° C. and at operating temperatures of the non-impact jet printer, and between 3-6% by weight of an inorganic salt electrolyte and between 3-6% by weight of a dye which is soluble in the glycol.
Claim 3
Dependent Claim
36 words
An ink according to claim 1 when the glycol is chosen from the group consisting of separately or as mixtures, ethylene glycol, propylene glycol, low molecular weight polyoxyethylene glycol, and polyglycols having molecular weight below 500.
Claim 4
Dependent Claim
26 words
An ink according to claim 1 wherein the electrolyte is chosen from the group consisting of sodium nitrite, sodium chloride and sodium nitrate or mixtures thereof.
Claim 5
Dependent Claim
35 words
The ink according to claim 1 wherein the glycol is in the formulation as a percentage by weight of between 89% and 93% by weight and the electrolyte is between 4% and 6% by weight.
Claim 6
Dependent Claim
28 words
The ink according to claim 1 wherein the glycol is formulated at 91% by weight, the electrolyte at 5% by weight and the dye at 4% by weight.
Claim 7
Dependent Claim
33 words
The ink according to claim 1 wherein the ink consists essentially of ethylene glycol at 91% by weight, sodium nitrite at 5% by weight and a diol soluble dye at 4% by weight.
References Cited (Backward Citations)
US3705043A
Cited
US3994736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |