US4339505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic coatings containing acrylamide copolymers
Assignee: Rohm and Haas Co
•
Filing: 1980-02-25
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Granted: 1982-07-13
•
Expires: 2000-02-25
Abstract
Abstract Electrically conductive paper is coated with an insulating coating to provide improved electrographic properties using a solvent-soluble copolymer comprising from 5% to 40% of copolymerized acrylamide or a monoethylenic derivative thereof. The coating is preferably pigmented with calcium carbonate, and the presence of the copolymerized acrylamide allows an increase in the pigment to binder ratio into the range of from 2:1 to 6:1.
Inventors
- 👤 Frank J. Ragas
- 👤 Ralph L. Minnis
- 👤 Gerson E. Beauchamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:11
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0208; G03G5/0217; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
29 words
Electrically conductive paper coated with an insulating coating comprising a solvent-soluble copolymer of monoethylenically unsaturated monomers comprising from 5% to 40% of copolymerized acrylamide or a monoethylenic derivative thereof.
Claim 2
Dependent Claim
29 words
Electrically conductive paper coated with an insulating coating comprising a solvent-soluble copolymer of monoethylenically unsaturated monomers comprising from 5% to 40% of copolymerized acrylamide or a monoethylenic derivative thereof.
Claim 3
Dependent Claim
19 words
Conductive paper as recited in claim 1 in which said copolymer comprises from 5% to 40% of copolymerized acrylamide.
Claim 4
Dependent Claim
14 words
Conductive paper as recited in claim 1 in which said insulating coating is pigmented.
Claim 5
Dependent Claim
14 words
Conductive paper as recited in claim 3 in which said pigment is calcium carbonate.
Claim 6
Dependent Claim
28 words
Conductive paper as recited in each of claims 3 and 4 in which said pigment is present in a pigment to binder ratio of from 2:1 to 6:1.
Claim 7
Dependent Claim
19 words
Conductive paper as recited in claim 5 in which said copolymer comprises from 7% to 30% of copolymerized acrylamide.
Claim 8
Dependent Claim
25 words
Conductive paper as recited in claim 6 in which the copolymer further comprises copolymerized C 1 -C 8 alkanol esters of acrylic and methacrylic acids.
Claim 9
Dependent Claim
20 words
Conductive paper as recited in claim 7 in which said copolymer contains at least about 30% of copolymerized methyl methacrylate.
Claim 10
Dependent Claim
21 words
Conductive paper as recited in claim 7 in which said copolymer also contains from 3-20% of copolymerized hydroxy functional monoethylenic monomer.
Claim 11
Dependent Claim
16 words
Conductive paper as recited in claim 9 in which said hydroxy functional monomer is 2-hydroxyethyl methacrylate.
Claim 12
Dependent Claim
21 words
Conductive paper as recited in claim 1 in which said copolymer is formed by solution copolymerization of said monoethylenically unsaturated monomers.
References Cited (Backward Citations)
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US3830655A
Cited
US3813264A
Cited
US3957710A
Cited
JPS5122729A
Cited
US4007148A
Cited
US4222901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |