Inventor

OHTA MASAFUMI

JP63 patents

⚠️ This page may combine multiple inventors who share the name “OHTA MASAFUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

OHTA MASAFUMI

RICOH KK

Positively-chargeable single-layered type electrophotographic photoconductor

Electrophotographic photoconductor and aromatic polycarbonate resin for use therein

Electrophotographic photoconductor and aromatic polycarbonate resin for use in the same

Electroluminescent device comprising oxadiazole compounds luminescent material, oxadiazole compounds for the device, and method of producing oxadiazole compounds

Electroluminescent device comprising oxadiazole compounds luminescent material, oxadiazole compounds for the device, and method of producing oxadiazole compounds

Method of producing oxadiazole compounds

Electroluminescent device comprising oxadiazole compounds luminescent material, oxadiazole compounds for the device, and method of producing oxadiazole compounds

Electroluminescent device

Electrophotographic element having charge transport layer

Electrophotographic photoconductor, aromatic polycarbonate resin for use in the same, and method of producing the aromatic polycarbonate resin

Electrophotographic photoconductor and triphenylamine compound for use therein

Photoelectric conversion element

Electrophotographic printing original plate and electrophotographic plate making process using the printing original plate

Electroluminescent device

Electroluminescent device

Electrophotographic photosensitive material with electron donors and electron acceptors

Triphenylamine compound for use in electrophotographic photoconductors

Trisazo compounds prepared from 4,4&#39;,4&#34;-triaminotriphenylamine and 2-hydroxy-3-phenylcarbamoylbenzo[a]carbazole derivatives

Electrophotographic photoconductor

Electrophotographic elements containing trisazo compounds

Electrophotographic material containing disazo compounds

Novel disazo compounds, process for the preparation of same and application of said disazo compounds and analogues thereof to electrophotographic sensitive materials

Disazo compounds, process for preparation of same and application of said disazo compounds and analogues thereof to electrophotographic sensitive materials

Diamine compounds for use in electrophotographic photoconductors

Electrophotographic photoconductor and diamine compounds for use in the same

Electrophotographic photoconductor

Disazo triphenylamine compounds

Disazo compound, method for preparing the same, and electrophotographic element containing the same for use in electrophotography

Electrophotographic element with trisazo photoconductor and an amine substituted charge transfer material

Electrophotographic photoconductor comprising a dithiol derivative

Electrophotographic photoconductor

Multilayer electrophotographic element containing a trisazo charge carrier generating substance and a hydrazone charge carrier transfer substance

3,6-Disazo-9-ethyl carbazole compounds

Electrophotographic sensitive materials containing disazo compounds

Electrophotographic sensitive materials containing a disazo pigment

Electrophotographic elements containing disazo compounds

Electrophotographic sensitive element having a photoconductive disazo pigment

Electrophotographic element containing a disazo pigment

2-Hydroxy-3-carbonylanilinonaphth-1-yl disazo derivatives and 1-phenyl-3-methyl-5-hydroxypyrazol-4-yl disazo derivatives of 1,4-bis(4-aminostyryl) benzene

Electrophotographic light-sensitive member

Optically anisotropic recording medium and method of recording and erasing information using the same

Multilayer electrophotographic element containing a trisazo charge carrier generating substance and an anthracene or divinyl benzene charge carrier transfer substance

Bis-azo compounds

Electrophotographic element having a bisazo photoconductor

Disazo compounds derived from 3,6-bis(styryl)-9-ethylcarbazole

Electrophotographic sensitive element with benzylamino carbazole charge transfer material

Photoconductive sensitive material with a trinitro-11-indeno[1,2-b]quinoxaline-11-one

RICOH CO LTD

Image forming apparatus and process cartridge

Electrophotographic photoreceptor, and image forming apparatus and process cartridge using the electrophotographic photoreceptor

HODOGAYA CHEMICAL CO LTD

Electrophotographic photoconductor and aromatic polycarbonate resin for use therein

Trisazo compounds prepared from 4,4',4"-triaminotriphenylamine and 2-hydroxy-3-phenylcarbamoylbenzo[a]carbazole derivatives