US5332599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous correction fluid
Assignee: Berol Corp
•
Filing: 1993-07-19
•
Granted: 1994-07-26
•
Expires: 2013-07-19
Abstract
Abstract An aqueous correction fluid is provided which includes a latex binder, an opacifying pigment, a protective colloid, a nonionic surfactant, an anionic dispersant, and water. Preferably, the polymer binder is provided in the form of an aqueous emulsion. The correction fluid has improved freeze-thaw stability.
Inventors
- 👤 Norman G. Sanborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:31
CPC Classifications
C; C09; C09D; C09D10/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
22 words
An aqueous correction fluid comprising a latex binder, an opacifying pigment, a protective colloid, a nonionic surfactant, an anionic dispersant, and water.
Claim 2
Dependent Claim
22 words
An aqueous correction fluid comprising a latex binder, an opacifying pigment, a protective colloid, a nonionic surfactant, an anionic dispersant, and water.
Claim 3
Dependent Claim
15 words
The correction fluid of claim 1 wherein the latex binder comprises an aqueous emulsion copolymer.
Claim 4
Dependent Claim
15 words
The correction fluid of claim 2 wherein the aqueous emulsion copolymer is ethylene vinyl acetate.
Claim 5
Dependent Claim
14 words
The correction fluid of claim 1 wherein the protective colloid is a cellulosic material.
Claim 6
Dependent Claim
15 words
The correction fluid of claim 4 wherein the protective colloid is hydroxypropyl or hydroxyethyl cellulose.
Claim 7
Dependent Claim
28 words
The correction fluid of claim 1 wherein the nonionic surfactant is a tetrafunctional block copolymer derived from sequential addition of propylene oxide and ethylene oxide to ethylene diamine.
Claim 8
Dependent Claim
18 words
The correction fluid of claim 1 wherein the anionic dispersant is a sodium salt of a carboxylate polyelectrolyte.
Claim 9
Dependent Claim
13 words
The correction fluid of claim 1 wherein the pigment is rutile titanium dioxide.
Claim 10
Dependent Claim
35 words
The correction fluid of claim 1 wherein said protective colloid, said nonionic surfactant and said anionic dispersant are present in sufficient amounts to enable the fluid to undergo at least 3 freeze-thaw cycles without coagulation.
Claim 11
Independent Claim
58 words
A method of covering a marking on a paper comprising the steps of contacting an applicator with a correction fluid comprising a latex binder, an opacifying pigment, a protective colloid, a nonionic surfactant, an anionic dispersant, and water, applying the fluid from the applicator to a marking on a paper surface, and allowing the correction fluid to dry.
Claim 12
Independent Claim
58 words
A method of covering a marking on a paper comprising the steps of contacting an applicator with a correction fluid comprising a latex binder, an opacifying pigment, a protective colloid, a nonionic surfactant, an anionic dispersant, and water, applying the fluid from the applicator to a marking on a paper surface, and allowing the correction fluid to dry.
Claim 13
Dependent Claim
19 words
The method of claim 10 further comprising the step of applying a corrective marking to the dried correction fluid.
Claim 14
Dependent Claim
14 words
The method of claim 10 wherein the latex binder comprises an aqueous emulsion copolymer.
Claim 15
Dependent Claim
13 words
The method of claim 12 wherein the aqueous emulsion copolymer is ethylene-vinyl acetate.
Claim 16
Dependent Claim
13 words
The method of claim 10 wherein the protective colloid is a cellulosic material.
Claim 17
Dependent Claim
12 words
The method of claim 14 wherein the protective colloid is hydroxypropyl cellulose.
Claim 18
Dependent Claim
26 words
The method of claim 10 wherein the nonionic surfactant a tetrafunctional block copolymer derived from sequential addition of propylene oxide and ethylene oxide to ethylene diamine.
Claim 19
Dependent Claim
17 words
The method of claim 10 wherein the anionic dispersant is a sodium salt of a carboxylate polyelectrolyte.
Claim 20
Dependent Claim
11 words
The method of claim 10 wherein the pigment is titanium dioxide.
Claim 21
Dependent Claim
34 words
The method of claim 10 wherein said protective colloid, said nonionic surfactant and said anionic dispersant are present in sufficient amounts to enable the fluid to undergo at least 3 freeze-thaw cycles without coagulation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |