US3649263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aeryl terpolymers as binders for electrophotographic compositions
Assignee: Ricoh Co Ltd
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Filing: 1968-12-11
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Granted: 1972-03-14
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Expires: 1988-12-11
Abstract
Abstract An electrophotographic copying material comprising a support and a photoconductive layer formed on one surface of said support, said photoconductive layer being formed in such a way that a photoconductive layer-forming solution-which is prepared by dispersing a photoconductive substance in an aqueous emulsion containing an acryl resin emulsified in water with an emulsifier consisting of an acidic compound and a volatile basic compound-is coated onto one surface of said support and then dried.
Inventors
- 👤 Kazuo Tubuko
- 👤 Nario Yamaguchi
- 👤 Sakae Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:33
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0532; G03G5/0546; G02; G02B; G02B26/00; G02B26/02; G02B26/04; G03G5/0503; G03G5/051; G03G5/0514; G03G5/0517
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
The method of claim 1 in which the volatile base is a member of the group consisting of ammonia, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, propylamine, butylamine, hexylamine, ethylenediamine, arylamine, morpholine, piperazine and hydrazine, and said volatile basic compound being present in said layer within a range not exceeding 0.5 percent per total weight of said photoconductive layer.
Claim 2
Dependent Claim
11 words
An electrophotographic copying material prepared by the process of claim 1.
Claim 3
Dependent Claim
64 words
An electrophotographic copying material according to claim 3, wherein said synthetic resin having an acid reaction is selected from the group consisting of an acryl-alkyd resin, pure alkyd resin, epoxy ester resin, nondrying-type pure alkyd resin, rosin-modified alkyd resin, phenol-modified alkyd resin, styrenated alkyd resin, natural resin-modified phenolic resin, natural resin-modified maleic acid resin, natural resin-modified pentaerythritol resin and natural resin-modified fumaric acid resin.
Claim 4
Dependent Claim
58 words
An electrophotographic copying material according to claim 3, wherein said natural resin is selected from the group consisting of elemi, gurjun balsam, jalap, scammonia, amber, bdellium, sagapenum, euphorbium, myrrh, opopanax, shellac, acaroid, dragon brad, mustic, styrax, canada balsam, mecca balsam, copaiba balsam, peru balsam, guaiac, tacamahac, galvanum, gamboge, olibanum, ammoniac, asafetida, copals, sandarack, true balsam and kawakawa resin.
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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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |