Inventor

OYAMA KOICHIRO

JP11 patents

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

RICOH CO LTD

3 patents

US11760893B2Sep 19, 2023

Ink, image forming apparatus, and image forming method

RICOH CO LTD0 citations57

US10844235B2Nov 24, 2020

Ink, method of manufacturing ink, and ink cartridge

RICOH CO LTD0 citations52

US10323134B2Jun 18, 2019

Particulate polyamide, and method for preparing the particulate polyamide

RICOH CO LTD0 citations48

KOIZUKA YUUSUKE

2 patents

US10233341B2Mar 19, 2019

Ink, method of manufacturing ink, and ink cartridge

KOIZUKA YUUSUKE2 citations71

US10273373B2Apr 30, 2019

Ink and method for producing same, and ink stored container, printing method, and printing apparatus

KOIZUKA YUUSUKE0 citations39

ARAI YOKO

1 patent

US10138344B2Nov 27, 2018

Particulate polyamide, and method for preparing the particulate polyamide

ARAI YOKO2 citations65

SAITO SHUN

1 patent

US12344756B2Jul 1, 2025

Liquid composition, method of applying liquid, device for applying liquid, pre-processing fluid, and set of pre-processing fluid and ink

SAITO SHUN0 citations57

HARADA SHIGEYUKI

1 patent

US9896530B2Feb 20, 2018

Copolymer, coloring material dispersion, ink, and ink store container

HARADA SHIGEYUKI0 citations51

YAMAZAKI TAKUYA

1 patent

US10807377B2Oct 20, 2020

Ink, ink cartridge, image forming method, and printed matter

YAMAZAKI TAKUYA0 citations49

SAGARA Amika

1 patent

US10836171B2Nov 17, 2020

Ink and cleaning liquid set, inkjet printing device, inkjet printing method, and method of cleaning nozzle surface of inkjet discharging head

SAGARA Amika0 citations47

YANAGAWA YOSHIKI

1 patent

US10000656B2Jun 19, 2018

Ink, recorded matter, ink container, recording device, and recording method

YANAGAWA YOSHIKI0 citations39