Patent US4061833A successfully refreshed from Google Patents.
US4061833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latex coatings for electrographic sheets
Assignee: Dow Chemical Co
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Filing: 1976-01-06
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Granted: 1977-12-06
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Expires: 1996-01-06
Abstract
Abstract An aqueous latex coating composition comprising a non-conductive, water-insoluble copolymer of (1) methacrylic acid or maleic acid, (2) a styrene compound, and (3) a conjugated diene hydrocarbon or an alkyl ester of methacrylic acid or of acrylic acid is coated onto a sheet which is conductive or is non-conductive but may have a conductive layer adhered thereto. Thereby, sheets having a dielectric coating for electrographic printing are produced.
Inventors
- 👤 Ronald R. Pelletier
- 👤 Robert D. Hansen
- 👤 James J. Vanderbush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:26
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0532; G03G5/0553; G03G5/0202; G03G5/0205; G03G5/0208; G03G5/0546; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
An electrostatic sheet suitable for electrographic printing comprising a substrate in the form of a flexible or rigid sheet having adhered to at least one surface thereof a continuous dielectric film consisting essentially of a copolymer of from about 0.5 percent to about 8 percent of methacrylic acid of maleic acid and the balance consisting essentially of (a) a styrene compound and (b) a conjugated diene hydrocarbon or an alkyl ester of acrylic acid or of methacrylic acid; said alkyl ester having from 1 to 18 carbon atoms in the alkyl.
Claim 2
Dependent Claim
91 words
An electrostatic sheet suitable for electrographic printing comprising a substrate in the form of a flexible or rigid sheet having adhered to at least one surface thereof a continuous dielectric film consisting essentially of a copolymer of from about 0.5 percent to about 8 percent of methacrylic acid of maleic acid and the balance consisting essentially of (a) a styrene compound and (b) a conjugated diene hydrocarbon or an alkyl ester of acrylic acid or of methacrylic acid; said alkyl ester having from 1 to 18 carbon atoms in the alkyl.
Claim 3
Dependent Claim
28 words
The electrostatic sheet of claim 1 in which the film includes a pigment in an amount not greater than about 2 parts for each part of the copolymer.
Claim 4
Dependent Claim
26 words
The electrostatic sheet of claim 1 in which the amount of copolymerized methacrylic acid or maleic acid is from about 1 percent to about 5 percent.
Claim 5
Dependent Claim
16 words
The electrostatic sheet of claim 3 in which the copolymer is a copolymer of methacrylic acid.
Claim 6
Dependent Claim
12 words
The electrostatic sheet of claim 1 in which the substrate is paper.
Claim 7
Dependent Claim
20 words
The electrostatic sheet of claim 1 in which the substrate also is coated with or impregnated with an electroconductive material.
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) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |