US5594045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Correction fluids
Assignee: Individual
•
Filing: 1993-05-25
•
Granted: 1997-01-14
•
Expires: 2013-05-25
Abstract
Abstract PCT No. PCT/GB93/01071 Sec. 371 Date Dec. 1, 1994 Sec. 102(e) Date Dec. 1, 1994 PCT Filed May 25, 1993 PCT Pub. No. WO93/24579 PCT Pub. Date Dec. 9, 1993Water-based correction fluids for covering typing, writing or drawing errors contain a particulate opacifier, a water-soluble or water-dispersible binder, water and a di- or tri-quaternary ammonium compound to prevent bleed of inks.
Inventors
- 👤 Michael Alexiou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:11
CPC Classifications
C; C09; C09D; C09D10/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A water-based correction fluid, which comprises a particulate opacifier, a water-soluble or water-dispersible polymeric binder, water and a di- or tri-quaternary ammonium compound of the formula: ##STR3## where R 1 and R 2 , which may be the same or different, are substituted or unsubstituted aliphatic groups containing from 4 to 20 carbon atoms, R 3 and R 4 , which may be the same or different, are substituted or unsubstituted alkylene groups containing up to 8 carbon atoms, which groups may be interrupted by one or more ethereal oxygen atoms, wherein A is an anion, and n is 0 or 1.
Claim 2
Dependent Claim
102 words
A water-based correction fluid, which comprises a particulate opacifier, a water-soluble or water-dispersible polymeric binder, water and a di- or tri-quaternary ammonium compound of the formula: ##STR3## where R 1 and R 2 , which may be the same or different, are substituted or unsubstituted aliphatic groups containing from 4 to 20 carbon atoms, R 3 and R 4 , which may be the same or different, are substituted or unsubstituted alkylene groups containing up to 8 carbon atoms, which groups may be interrupted by one or more ethereal oxygen atoms, wherein A is an anion, and n is 0 or 1.
Claim 3
Dependent Claim
72 words
A correction fluid according to claim 1, in which, in the compound R 1 and R 2 are both --C 8 H 17 , --C 10 H 21 , --C 12 H 25 , --C 14 H 29 , or --C 18 H 37 ; R 3 and R 4 are both --C 2 H 4 -- or --C 3 H 6 --, and A -- is a chloride or bromide anion.
Claim 4
Dependent Claim
42 words
A correction fluid according to claim 1, which comprises, by weight, from 40 to 70% of opacifier, from 1 to 10 % of polymeric binder, from 25 to 30% of water, and from 1 to 10% of di- or tri-quaternary ammonium compound.
Claim 5
Dependent Claim
14 words
A correction fluid according to claim 1 in which the opacifier is titanium dioxide.
Claim 6
Dependent Claim
19 words
A correction fluid according to claim 1 which additionally comprises up to 30% by weight of an inert filler.
Claim 7
Dependent Claim
27 words
A correction fluid according to claim 5, in which the inert filler is powdered calcium carbonate or hollow microspheres of hydrated alumina, alumina-silica alloy, or acrylate-styrene copolymer.
Claim 8
Dependent Claim
14 words
A correction fluid according to claim 1 further including zinc oxide and zinc acetate.
Claim 9
Dependent Claim
23 words
A correction fluid according to claim 1 wherein the polymeric binder is polyvinyl alcohol or a water-dispersible or -soluble acrylic polymer or polyurethane.
Claim 10
Dependent Claim
19 words
A correction fiuid according to claim 8 which comprises from 1 to 5% by weight of the polymeric binder.
Claim 11
Dependent Claim
28 words
A correction fluid according to claim I which additionally comprises from 1 to 5% by weight of a dispersing agent which is compatible with the cationic materials present.
Claim 12
Dependent Claim
23 words
A correction fluid according to claim 1 which additionally comprises up to 10% by weight of a cationically modified clay and/or powdered polyacrylonitrile.
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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) | 2000-01-14 | 2000-07-15 | 2001-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-14 | 2004-07-15 | 2005-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-14 | 2008-07-15 | 2009-01-14 | $7700.00 | Window Closed / Lapsed |