Patent US5108503A successfully refreshed from Google Patents.
US5108503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smear resistant inks for ink-jet printers
Assignee: HP Inc
•
Filing: 1991-04-16
•
Granted: 1992-04-28
•
Expires: 2011-04-16
Abstract
Abstract Inks for ink-jet printing have improved water resistance and smear resistance when they contain from about 2.5 to 25%, preferably from about 7.5% to about 12.5%, by weight, 2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone, or mixtures thereof.
Inventors
- 👤 Suraj L. Hindagolla
- 👤 John M. Skene
- 👤 Charles L. Thierheimer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:09
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
56 words
An ink-jet ink suitable for ink-jet printing, comprising, by weight: (a) from about 2.5% to about 25% of a pyrrolidone selected from the group consisting of 2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone, and mixtures thereof; (b) from about 1% to about 10% dye; and (c) the balance water, said ink having a pH ranging from about 4 to about 12.
Claim 2
Dependent Claim
56 words
An ink-jet ink suitable for ink-jet printing, comprising, by weight: (a) from about 2.5% to about 25% of a pyrrolidone selected from the group consisting of 2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone, and mixtures thereof; (b) from about 1% to about 10% dye; and (c) the balance water, said ink having a pH ranging from about 4 to about 12.
Claim 3
Dependent Claim
17 words
The ink of claim 1 which is buffered to a pH from about 6 to about 9.
Claim 4
Dependent Claim
17 words
The ink of claim 2 which is buffered to a pH from about 7 to about 7.5.
Claim 5
Dependent Claim
17 words
The ink of claim 2 which contains, as buffer, ammonium acetate, 2-(N-morpholino) ethanesulfonic acid, or 3-(N-morpholino)-2-hydroxypropanesulfonic acid.
Claim 6
Dependent Claim
9 words
The ink of claim 1 which contains a biocide.
Claim 7
Dependent Claim
13 words
The ink of claim 2 which contains a non-corrosive, low toxicity, water-soluble salt.
Claim 8
Dependent Claim
15 words
The ink of claim 6 wherein the non-corrosive salt is a lower alkyl ammonium chloride.
Claim 9
Dependent Claim
19 words
The ink of claim 2 wherein the pyrrolidone is present in a range from about 7.5% to about 12.5%.
Claim 10
Dependent Claim
19 words
The ink of claim 2 wherein the dye is present in a range from about 1% to about 4%.
Claim 11
Dependent Claim
17 words
The ink of claim 2 which contains from up to about 10% of a drying time improver.
Claim 12
Dependent Claim
22 words
The ink of claim 10 wherein the drying time improver is a lower alcohol having from 1 to about 4 carbon atoms.
Claim 13
Dependent Claim
18 words
The ink of claim 11 which contains from about 2% to about 3% of a drying time improver.
Claim 14
Dependent Claim
14 words
The ink of claim 12 which contains from about 2% to about 3% 1-propanol.
Claim 15
Dependent Claim
14 words
The ink of claim 1 further including up to about 5% of a glycol.
Claim 16
Dependent Claim
66 words
An ink-jet ink suitable for ink-jet printing, comprising, by weight: (a) from about 7.5% to about 12.5% of a pyrrolidone selected from the group consisting of 2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone, and mixtures thereof; (b) from about 1% to about 4% dye; (c) sufficient ammonium acetate, 2-(N-morpholino) ethanesulfonic acid, or 3-(N-morpholino)-2-hydroxypropane to provide the ink with a pH from about 7 to about 7.5; and (d) the balance water.
Claim 17
Dependent Claim
66 words
An ink-jet ink suitable for ink-jet printing, comprising, by weight: (a) from about 7.5% to about 12.5% of a pyrrolidone selected from the group consisting of 2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone, and mixtures thereof; (b) from about 1% to about 4% dye; (c) sufficient ammonium acetate, 2-(N-morpholino) ethanesulfonic acid, or 3-(N-morpholino)-2-hydroxypropane to provide the ink with a pH from about 7 to about 7.5; and (d) the balance water.
Claim 18
Dependent Claim
16 words
The ink of claim 15 which contains from about 2% to about 3% drying time improver.
Claim 19
Dependent Claim
12 words
The ink of claim 16 wherein the drying time improver is 1-propanol.
Claim 20
Dependent Claim
14 words
The ink of claim 15 further including up to about 5% of a glycol.
Claim 21
Dependent Claim
84 words
An ink-jet ink suitable for ink-jet printing, consisting essentially of, by weight: (a) from about 7.5% to about 12.5% of a pyrrolidone selected from the group consisting of 2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone, and mixtures thereof; (b) from about 1% to about 4% dye; (c) sufficient ammonium acetate, 2-(N-morpholino) ethanesulfonic acid, or 3-(N-morpholino)-2-hydroxypropane to provide the ink with a pH from about 7 to about 7.5; (d) from about 2% to about 3% drying time improver; (e) up to about 5% glycol; and (f) the balance water.
Claim 22
Dependent Claim
84 words
An ink-jet ink suitable for ink-jet printing, consisting essentially of, by weight: (a) from about 7.5% to about 12.5% of a pyrrolidone selected from the group consisting of 2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrrolidone, and mixtures thereof; (b) from about 1% to about 4% dye; (c) sufficient ammonium acetate, 2-(N-morpholino) ethanesulfonic acid, or 3-(N-morpholino)-2-hydroxypropane to provide the ink with a pH from about 7 to about 7.5; (d) from about 2% to about 3% drying time improver; (e) up to about 5% glycol; and (f) the balance water.
Claim 23
Dependent Claim
12 words
The ink of claim 19 wherein the drying time improver is 1-propanol.
References Cited (Backward Citations)
US5026425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |