US4961785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smear resistant inks for thermal ink-jet printers
Assignee: HP Inc
•
Filing: 1989-02-09
•
Granted: 1990-10-09
•
Expires: 2009-02-09
Abstract
Abstract Inks for ink-jet printing have improved smear resistance when they contain from about 15 to 50%, preferably from about 20% to about 30%, formamide.
Inventors
- 👤 John M. Skene
- 👤 Charles L. Thierheimer, Jr.
- 👤 Suraj L. Hindagolla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:14
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
An ink suitable for ink-jet printing, consisting of, by weight, (a) from about 15% to about 50% formamide, (b) from about 1% to about 10% dye, (c) a buffer to provide a pH from about 4 to about 10, (d) from 0% up to about 10% drying time improver selected from the group consisting of lower alcohols having from 1 to about 4 carbon atoms, (e) from 0% up to about 0.1% of a non-corrosive, low toxicity, water-soluble conductive salt, (f) a biocide, and (g) water.
Claim 2
Dependent Claim
86 words
An ink suitable for ink-jet printing, consisting of, by weight, (a) from about 15% to about 50% formamide, (b) from about 1% to about 10% dye, (c) a buffer to provide a pH from about 4 to about 10, (d) from 0% up to about 10% drying time improver selected from the group consisting of lower alcohols having from 1 to about 4 carbon atoms, (e) from 0% up to about 0.1% of a non-corrosive, low toxicity, water-soluble conductive salt, (f) a biocide, and (g) water.
Claim 3
Dependent Claim
18 words
An ink of claim 1 which has been buffered to a pH from about 6 to about 7.
Claim 4
Dependent Claim
18 words
An ink of claim 1 which contains, as buffer, ammonium acetate, ammonium formate, 2-[N-morpholino] ethanesulfonic acid, or 3-[N-morpholino]-2-hydroxypropane.
Claim 5
Dependent Claim
19 words
An ink of claim 1 wherein the formamide is present in a range from about 20% to about 30%.
Claim 6
Dependent Claim
19 words
An ink of claim 1 wherein the dye is present in a range from about 1% to about 4%.
Claim 7
Dependent Claim
18 words
An ink of claim 1 which contains from about 2% to about 3% of a drying time improver.
Claim 8
Dependent Claim
14 words
An ink of claim 1 which contains from about 2% to about 3% 1-propanol.
Claim 9
Dependent Claim
14 words
An ink of claim 1 wherein the salt is a lower alkyl ammonium chloride.
Claim 10
Dependent Claim
88 words
An ink suitable for ink-jet printing, consisting of, by weight, (a) from about 20% to about 30% formamide, (b) from about 1% to about 4% dye, (c) sufficient buffer to provide the ink with a pH from about 6 to about 7, (d) from about 0% to about 3% drying time improver selected from the group consisting of lower alcohols having from 1 to about 4 carbon atoms, (e) from 0% to about 0.1% of a non-corrosive, low toxicity, water-soluble conductive salt, (f) a biocide, and (g) water.
Claim 11
Dependent Claim
88 words
An ink suitable for ink-jet printing, consisting of, by weight, (a) from about 20% to about 30% formamide, (b) from about 1% to about 4% dye, (c) sufficient buffer to provide the ink with a pH from about 6 to about 7, (d) from about 0% to about 3% drying time improver selected from the group consisting of lower alcohols having from 1 to about 4 carbon atoms, (e) from 0% to about 0.1% of a non-corrosive, low toxicity, water-soluble conductive salt, (f) a biocide, and (g) water.
Claim 12
Dependent Claim
12 words
An ink of claim 9 wherein the drying time improver is 1-propanol.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |