US3946140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic recording material
Assignee: Agfa Gevaert NV
•
Filing: 1973-04-12
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Granted: 1976-03-23
•
Expires: 1993-04-12
Abstract
Abstract A non-photoconductive insulating layer for use in an electrographic recording material comprises a copolymer of 50 to 91 % by weight of vinyl acetate, 8 to 50 % by weight of a vinyl ester of a fatty acid of 12 to 18 carbon atoms, and 0 to 2 % by weight of crotonic acid.
Inventors
- 👤 Robert Joseph Noe
- 👤 Pierre Jean Rutten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:19
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0208; G03G5/10; G03G5/101; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31935
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
An electrographic recording material comprising a conductive sheet support having a surface resistivity not exceeding about 1 × 10 10 ohm/sq. and carried on said support a non-photoconductive insulating layer consisting essentially of about 2-20 gms dry weight per sq.m. of a copolymer of about 50-91% by weight of vinyl acetate, about 8-50% by weight of a vinyl ester of a C 12-18 fatty acid, and about 0-2% by weight of crotonic acid, and up to 400% by weight of said copolymer of a finely divided non-photoconductive pigment.
Claim 2
Dependent Claim
88 words
An electrographic recording material comprising a conductive sheet support having a surface resistivity not exceeding about 1 × 10 10 ohm/sq. and carried on said support a non-photoconductive insulating layer consisting essentially of about 2-20 gms dry weight per sq.m. of a copolymer of about 50-91% by weight of vinyl acetate, about 8-50% by weight of a vinyl ester of a C 12-18 fatty acid, and about 0-2% by weight of crotonic acid, and up to 400% by weight of said copolymer of a finely divided non-photoconductive pigment.
Claim 3
Dependent Claim
50 words
A recording material according to claim 1, wherein the copolymer comprises 80 to 91 % by weight of vinyl acetate, 8 to 20 % by weight of a vinyl ester of a fatty acid of 12 to 18 carbon atoms, and 0 to 2 % by weight of crotonic acid.
Claim 4
Dependent Claim
33 words
A recording material according to claim 1, wherein the copolymer comprises 90.5 % by weight of vinyl acetate, 8 % by weight of vinyl laurate, and 1.5 % by weight of crotonic acid.
Claim 5
Dependent Claim
35 words
A recording material according to claim 1, wherein the insulating layer comprises a finely divided non-photoconductive pigment in an amount between 0.1 and 400 % by weight with respect to the weight of the copolymer.
Claim 6
Dependent Claim
15 words
An electrographic recording material according to claim 1, wherein the support is a paper web.
Claim 7
Dependent Claim
22 words
An electrographic recording material according to claim 1, wherein the support is a paper web that has been impregnated with potassium nitrate.
Claim 8
Dependent Claim
18 words
The material of claim 1 wherein said pigment has a grain size not in excess of 20 micron.
Claim 9
Dependent Claim
16 words
The material of claim 1 wherein said pigment has a grain size not about 1 micron.
Claim 10
Dependent Claim
20 words
The material of claim 1 wherein said insulating layer contains about 4-10 gm dry weight per sq.m. of said copolymer.
Claim 11
Dependent Claim
16 words
The recording material of claim 1 wherein said vinyl ester is vinyl laurate or vinyl stearate.
Claim 12
Dependent Claim
18 words
The recording material of claim 1 wherein said support is a paper web carrying a conductive intermediate layer.
Claim 13
Dependent Claim
25 words
An electrographic recording material according to claim 11 wherein said conductive layer is a conductive polymer formed of recurring units of the formula : ##EQU3##
Claim 14
Dependent Claim
75 words
In an electrographic recording method in which an electrostatic charge pattern is formed on an electrically insulating non-photoconductive layer, the improvement wherein said insulating layer consists essentially of a copolymer of about 50-91% by weight of vinyl acetate, about 8-50% by weight of a vinyl ester of a C 12-18 fatty acid, and about 0-2% by weight of crotonic acid, and up to 400% by weight of said copolymer of a finely divided non-photoconductive pigment.
Claim 15
Dependent Claim
75 words
In an electrographic recording method in which an electrostatic charge pattern is formed on an electrically insulating non-photoconductive layer, the improvement wherein said insulating layer consists essentially of a copolymer of about 50-91% by weight of vinyl acetate, about 8-50% by weight of a vinyl ester of a C 12-18 fatty acid, and about 0-2% by weight of crotonic acid, and up to 400% by weight of said copolymer of a finely divided non-photoconductive pigment.
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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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |