Patent US5217255A successfully refreshed from Google Patents.
US5217255A
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US
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Erasable system including marking surface and erasable ink composition
Assignee: Berol Corp
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Filing: 1988-12-19
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Granted: 1993-06-08
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Expires: 2008-12-19
Abstract
Abstract An erasable system including an element having a porous marking surface and an erasable marking composition for applying markings to the porous marking surface. The marking composition comprises an aqueous dispersion of particles of film-forming polymeric materials and a colorant, and the marking composition provides an erasable, substantially water-insoluble coalesced residue on the marking surface.
Inventors
- 👤 Nan J. Lin
- 👤 Peter G. Hanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:06
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/502; B41M5/508; B41M5/5254; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249959; Y10T428/249994; Y10T428/249995; Y10T428/249996; Y10T428/25; Y10T428/254; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
110 words
An erasable system comprising a marking element and a marking composition for applying markings to the element, said marking element providing a porous marking surface having an average surface pore diameter between about 0.05 to about 1.0 microns, said marking composition comprising an aqueous dispersion of particles of a film-forming polymeric material having an average particle diameter between about 0.04 to about 0.5 microns and a colorant, said marking composition providing an erasable, coalesced residue on drying which is substantially water insoluble, and where the ratio of the average surface pore diameter of the porous surface to the average particle diameter of the polymeric material is less than about 20.
Claim 2
Dependent Claim
110 words
An erasable system comprising a marking element and a marking composition for applying markings to the element, said marking element providing a porous marking surface having an average surface pore diameter between about 0.05 to about 1.0 microns, said marking composition comprising an aqueous dispersion of particles of a film-forming polymeric material having an average particle diameter between about 0.04 to about 0.5 microns and a colorant, said marking composition providing an erasable, coalesced residue on drying which is substantially water insoluble, and where the ratio of the average surface pore diameter of the porous surface to the average particle diameter of the polymeric material is less than about 20.
Claim 3
Dependent Claim
13 words
A system of claim 1 where the ratio is less than about 10.
Claim 4
Dependent Claim
42 words
A system of claim 2, where the polymeric material is a film-forming, polymeric material selected from the group consisting of a conjugated diene-containing polymeric material, a styrene-containing polymeric material, an acrylonitrile-containing polymeric material, a carboxylated acrylonitrile-containing polymeric material and mixtures of these.
Claim 5
Dependent Claim
12 words
A system of claim 2 where the colorant is substantially water insoluble.
Claim 6
Dependent Claim
19 words
A system of claim 2 where the colorant is rendered substantially water insoluble on drying of the marking composition.
Claim 7
Dependent Claim
33 words
A system of claim 2 where the amount of polymeric material in the marking composition is between about 3 to about 70 percent by weight based on the total weight of the composition.
Claim 8
Dependent Claim
21 words
A system of claim 6 where the amount of polymeric material is between about 10 to about 60 percent by weight.
Claim 9
Dependent Claim
20 words
A system of claim 2 where the amount of colorant is between about 0.1 to about 40 percent by weight.
Claim 10
Dependent Claim
20 words
A system of claim 8 where the amount of colorant is between about 0.3 to about 15 percent by weight.
Claim 11
Dependent Claim
18 words
A system of claim 2 where the average particle diameter is between about 0.05 to about 0.30 microns.
Claim 12
Dependent Claim
16 words
A system of claim 2 where the erasable marking composition is retained in a ball-point pen.
Claim 13
Dependent Claim
22 words
A system of claim 1 wherein said marking element comprises a plurality of superposed sheets bound in the form of a book.
Claim 14
Dependent Claim
139 words
An erasable system comprising a marking element and a marking composition for applying markings to the element, said marking element providing a porous marking surface having an average surface pore diameter between about 0.05 to about 1.0 microns and comprising a fibrous or paper substrate which has been coated with or immersed in a material to reduce the original average surface pore diameter of the porous surface, said marking composition comprising an aqueous dispersion of particles of a film-forming polymeric material having an average particle diameter between about 0.04 to about 0.5 microns and a colorant, said marking composition providing an erasable, coalesced residue on drying which is substantially water insoluble, and where the ratio of the average surface pore diameter of the porous surface to the average particle diameter of the polymeric material is less than about 20.
Claim 15
Dependent Claim
139 words
An erasable system comprising a marking element and a marking composition for applying markings to the element, said marking element providing a porous marking surface having an average surface pore diameter between about 0.05 to about 1.0 microns and comprising a fibrous or paper substrate which has been coated with or immersed in a material to reduce the original average surface pore diameter of the porous surface, said marking composition comprising an aqueous dispersion of particles of a film-forming polymeric material having an average particle diameter between about 0.04 to about 0.5 microns and a colorant, said marking composition providing an erasable, coalesced residue on drying which is substantially water insoluble, and where the ratio of the average surface pore diameter of the porous surface to the average particle diameter of the polymeric material is less than about 20.
Claim 16
Dependent Claim
22 words
A system of claim 13 wherein said marking element comprises a plurality of superposed sheets bound in the form of a book.
Claim 17
Dependent Claim
13 words
A system of claim 13 wherein said ratio is less than about 10.
Claim 18
Dependent Claim
107 words
A marking element comprising a plurality of superposed paper sheets bound in the form of a book, each sheet providing a porous paper surface having an average surface pore diameter between about 0.05 to about 1.0 microns and carrying a dry, substantially water-insoluble, erasable, coalesced residue provided by a marking composition comprising an aqueous dispersion of particles of a film-forming polymeric material having an average particle diameter between about 0.04 to about 0.5 microns and a colorant and where the ratio of the average pore size of the porous surface to the average particle size of the polymeric material of the dispersion is less than about 20.
Claim 19
Dependent Claim
107 words
A marking element comprising a plurality of superposed paper sheets bound in the form of a book, each sheet providing a porous paper surface having an average surface pore diameter between about 0.05 to about 1.0 microns and carrying a dry, substantially water-insoluble, erasable, coalesced residue provided by a marking composition comprising an aqueous dispersion of particles of a film-forming polymeric material having an average particle diameter between about 0.04 to about 0.5 microns and a colorant and where the ratio of the average pore size of the porous surface to the average particle size of the polymeric material of the dispersion is less than about 20.
Claim 20
Dependent Claim
38 words
A marking element of claim 16 where the ratio is less than about 10 and each sheet has been coated with or immersed in a material to reduce the original average surface pore diameter of the porous surface.
Claim 21
Dependent Claim
41 words
A marking element of claim 17 where the residue includes a polymeric material selected from the group consisting of a conjugated diene-containing polymeric material, a styrene-containing polymeric material, an acrylonitrile-containing polymeric material, a carboxylated acrylonitrile-containing polymeric material and mixtures of these.
Claim 22
Dependent Claim
19 words
A marking element of claim 17 where the average surface pore diameter is between about 0.05 to about 0.75.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |