Inventor
Toshio Fukagai
Inventor
Numazu, JP
Overview
Patents· 21 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G03Gprimary
G03GElectrography68%
C07CAcyclic or carbocyclic compounds10%
C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds10%
H04NPictorial communication, e.g. television6%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments3%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%
PatentTitleYear
6,830,857'Image forming method, image forming apparatus, process cartridge and photoconductor'20046,821,694'Image forming method, image forming apparatus, process cartridge and photoconductor'20046,649,313'Photoreceptor, method of evaluating a photoreceptor, and method of producing the photoreceptor'20036,534,227'Photoreceptor, method of evaluating the photoreceptor, method of producing the photoreceptor, and image formation apparatus using the photoreceptor'20036,521,388'Electrophotographic image forming apparatus, and photoreceptor therefor'20035,670,284'Electrophotographic photoconductor'19975,608,010'Polymers of acrylic acid ester derivatives having a triphenyl amine skeleton'19975,488,137'Acrylic acid ester derivative having a triphenyl amine skeleton'19965,427,880'Electrophotographic Photoconductor'19955,339,138'Electrophotographic image formation method'19945,322,753'Electrophotographic photoconductor and acrylic acid ester polymer for use in the same'19945,135,829'Electrophotographic photoconductor having intermediate layer comprising modified indium oxide'19924,970,131'Electrophotographic photoconductor having overcoat layer'19904,946,766'Electrophotographic photoconductor having intermediate layer comprising indium oxide'19904,906,545'Electrophotographic photoconductor with undercoat layer containing metal oxide on support'19904,863,822'Electrophotographic photoconductor comprising charge generating and transport layers containing adjuvants'19894,830,942'Electrophotographic photoconductor'19894,822,705'Electrophotographic photoconductor with layer preventing charge injection'19894,481,271'Layered electrophotographic photoconductor containing a hydrazone'19844,390,608'Layered charge generator/transport electrophotographic photoconductor uses bisazo pigment'19834,284,698'Layered electrophotographic photoconductor'1981Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1981–2004Patents assigned to RICOH KK (21)· patent assignee history
1981–2003Based in Shizuoka, JP· patent location history
1983–2004Based in Numazu, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| RICOH KK | 21 | 1981–2004 |
Locations
| Location | Patents | Span |
|---|---|---|
| Numazu, JP | 17 | 1983–2004 |
| Shizuoka, JP | 4 | 1981–2003 |