US4155768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waterfast ink for use in ink jet printing
Assignee: International Business Machines Corp
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Filing: 1977-12-05
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Granted: 1979-05-22
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Expires: 1997-12-05
Abstract
Abstract An ink for use in ink jet printers is provided. The ink contains a water soluble dye, a polyamine containing 6 or fewer nitrogen atoms per molecule, with the ink composition having a pH of 8 or below. The ink has improved waterfastness over an equivalent ink formulation without the polyamine additive.
Inventors
- 👤 Genevieve M. Adams
- 👤 Richard D. Balanson
- 👤 Clinton D. Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:03
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
An ink composition comprising an aqueous solution of at least one water soluble dye in about 1/2% to about 10% by weight concentration and a polyamine having 6 or fewer nitrogen atoms per molecule in about 1/2% to about 5% by weight concentration, with the composition having a pH of 8 or below.
Claim 2
Dependent Claim
53 words
An ink composition comprising an aqueous solution of at least one water soluble dye in about 1/2% to about 10% by weight concentration and a polyamine having 6 or fewer nitrogen atoms per molecule in about 1/2% to about 5% by weight concentration, with the composition having a pH of 8 or below.
Claim 3
Dependent Claim
28 words
A composition as claimed in claim 1 where the water soluble dye is chosen from the group consisting of Colour Index Direct Dyes and Colour Index Acid Dyes.
Claim 4
Dependent Claim
14 words
A composition as claimed in claim 1 where the polyamine contains no primary nitrogens.
Claim 5
Dependent Claim
12 words
A composition as claimed in claim 1 having a pH of 7.
Claim 6
Dependent Claim
13 words
A composition as claimed in claim 1 in which the polyamine is permethylated.
Claim 7
Dependent Claim
10 words
A composition as claimed in claim 1 comprising a penetrant.
Claim 8
Dependent Claim
10 words
A composition as claimed in claim 1 comprising a sequestrant.
Claim 9
Dependent Claim
18 words
A composition as claimed in claim 1 wherein the polyamine is present at about 2% by weight concentration.
Claim 10
Dependent Claim
13 words
A composition as claimed in claim 1 wherein the polyamine is permethylated tetraethylenepentamine.
References Cited (Backward Citations)
US3891581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |