US3998987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording element
Assignee: TOMOEGAWA PAPER Manufacturing Co Ltd
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Filing: 1975-01-23
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Granted: 1976-12-21
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Expires: 1995-01-23
Abstract
Abstract An electrostatic recording element comprising a conductive layer and a surface layer electrostatically chargeable upon application of an electric field, said surface consisting of an upper recording layer and a lower insulating layer, and said recording layer containing highly insulating hydrophobic resin and an elevated amount of inorganic or organic pigment whereas said insulating layer either consisting solely of highly insulating hydrophobic resin or containing only a small amount of said pigment together with said resin which is scribable or stampable with water-soluble ink without deteriorating the recording characteristics and is at the same time capable or preventing fingerprints, and which can further be utilized as a lithographic printing plate.
Inventors
- 👤 Kiichi Kirigaya
- 👤 Makoto Ogiwara
- 👤 Syosaku Koseki
- 👤 Toshiho Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:37
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0217; G03G5/0205; G03G5/0208; G03G5/0211; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31935; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
180 words
An electrostatic recording element having a conductive layer and a surface layer electrostatically chargeable upon application of an electric field, said surface layer consisting of an upper recording layer and a lower insulating layer adjacent the conductive layer, said recording layer comprising an insulating hydrophobic resin and a non-photosensitive, inorganic pigment in a ratio of from about 100 to about 1000 parts by weight per 100 parts by weight of said resin, and said lower insulating layer comprising an insulating hydrophobic resin and a non-photosensitive, inorganic pigment in a ratio of 0 up to no more than 30 parts by weight per 100 parts by weight of said resin, said non-photosensitive, inorganic pigment in both the recording layer and the insulating layer being selected from the group consisting of calcium carbonate, lithopone, clay, talc, silica, starch, beryllium oxide, and magnesium oxide, and said insulating hydrophobic resin in both the recording layer and the insulating layer being selected from the group consisting of polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polyacrylate, polysiloxane, polystyrene, vinyl chloride-vinyl acetate copolymer, and methyl methacrylateethyl acrylate copolymer.
Claim 2
Dependent Claim
180 words
An electrostatic recording element having a conductive layer and a surface layer electrostatically chargeable upon application of an electric field, said surface layer consisting of an upper recording layer and a lower insulating layer adjacent the conductive layer, said recording layer comprising an insulating hydrophobic resin and a non-photosensitive, inorganic pigment in a ratio of from about 100 to about 1000 parts by weight per 100 parts by weight of said resin, and said lower insulating layer comprising an insulating hydrophobic resin and a non-photosensitive, inorganic pigment in a ratio of 0 up to no more than 30 parts by weight per 100 parts by weight of said resin, said non-photosensitive, inorganic pigment in both the recording layer and the insulating layer being selected from the group consisting of calcium carbonate, lithopone, clay, talc, silica, starch, beryllium oxide, and magnesium oxide, and said insulating hydrophobic resin in both the recording layer and the insulating layer being selected from the group consisting of polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polyacrylate, polysiloxane, polystyrene, vinyl chloride-vinyl acetate copolymer, and methyl methacrylateethyl acrylate copolymer.
Claim 3
Dependent Claim
15 words
An electrostatic recording element according to claim 1, wherein said non-photosensitive pigment is beryllium oxide.
Claim 4
Dependent Claim
15 words
An electrostatic recording element according to claim 1, wherein said non-photosensitive pigment is magnesium oxide.
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) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |