Patent US4532276A successfully refreshed from Google Patents.
US4532276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing fluid
Assignee: J. S.
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Filing: 1984-02-22
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Granted: 1985-07-30
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Expires: 2004-02-22
Abstract
Abstract A writing or recording fluid on an aqueous basis, such as an ink, comprising coloring agents, binder, water and, optionally, other additives. The invention discloses polyurethane, preferably a linear polyurethane in aqueous dispersions as the binder.
Inventors
- 👤 Thomas Knable
- 👤 Lydia Sollner
- 👤 Richard Wethey
- 👤 Ilse Otte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:06
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
In a writing or recording fluid on an aqueous basis such as an aqueous ink, wherein the fluid comprises coloring agent, binder, water and, optionally, other additives, the improvement which comprises that it contains as binder a polyurethane which, before it is mixed with other components, is in the form of an aqueous dispersion and wherein the coloring agent comprises pigments which, before they are mixed with the other components, are present as a pigment dispersion or pigment paste.
Claim 2
Dependent Claim
79 words
In a writing or recording fluid on an aqueous basis such as an aqueous ink, wherein the fluid comprises coloring agent, binder, water and, optionally, other additives, the improvement which comprises that it contains as binder a polyurethane which, before it is mixed with other components, is in the form of an aqueous dispersion and wherein the coloring agent comprises pigments which, before they are mixed with the other components, are present as a pigment dispersion or pigment paste.
Claim 3
Dependent Claim
12 words
The improvement of claim 1, wherein the polyurethane is a linear polyurethane.
Claim 4
Dependent Claim
44 words
The improvement of claim 1, wherein the aqueous polyurethane dispersion contains 30 to 60 weight percent of solid content and has a viscosity of 10 to 200 cP at 20° C., and wherein the pigment dispersion contains 20 to 60 weight percent of pigment.
Claim 5
Dependent Claim
30 words
The improvement of claim 1, wherein the aqueous polyurethane dispersion has 35 to 50 weight percent of solid content and a viscosity of 30 to 100 cP at 20° C.
Claim 6
Dependent Claim
13 words
The improvement of claim 1, wherein glycols and/or polysaccharides are present as thickeners.
Claim 7
Dependent Claim
10 words
The improvement of claim 1, wherein the fluid comprises protein.
Claim 8
Dependent Claim
11 words
The improvement of claim 6 wherein the protein is sodium caseinate.
Claim 9
Dependent Claim
16 words
The improvement of claim 1, wherein the fluid comprises aliphatic and/or aromatic alcohols, ketones and/or esters.
Claim 10
Dependent Claim
12 words
The improvement of claim 1, wherein the fluid comprises an UV absorber.
Claim 11
Dependent Claim
12 words
The improvement of claim 1, wherein the fluid comprises soluble coloring agent.
Claim 12
Dependent Claim
14 words
The improvement of claim 10, wherein the soluble coloring agent is an acidic dye.
Claim 13
Dependent Claim
53 words
An ink comprising 3 to 40 weight percent of polyurethane as binder; 2 to 40 weight percent of coloring agent; 25 to 90 weight percent of water; up to 15 weight percent of alcohols, ketones and/or esters, as well as up to 35 weight percent of proteins, glycols, UV absorber, and/or other additives.
Claim 14
Dependent Claim
53 words
An ink comprising 3 to 40 weight percent of polyurethane as binder; 2 to 40 weight percent of coloring agent; 25 to 90 weight percent of water; up to 15 weight percent of alcohols, ketones and/or esters, as well as up to 35 weight percent of proteins, glycols, UV absorber, and/or other additives.
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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |