Inventor
KOGA RITSUO
JP11 patents
⚠️ This page may combine multiple inventors who share the name “KOGA RITSUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
ZERO LAB CO LTD
6 patentsUS10046592B2Aug 14, 2018
Magnetic pen
ZERO LAB CO LTD2 citations70
US12530092B2Jan 20, 2026
Magnetic sheet, magnetic writing system, drawing method, and erasing method
ZERO LAB CO LTD0 citations59
US11769429B2Sep 26, 2023
Magnetic erasing device
ZERO LAB CO LTD0 citations59
US10997880B2May 4, 2021
Magnetic erasing device
ZERO LAB CO LTD0 citations59
US10442236B2Oct 15, 2019
Magnetic pen
ZERO LAB CO LTD1 citations59
US11335487B2May 17, 2022
Magnetic eraser, writing system and display device
ZERO LAB CO LTD0 citations49
PLUS KK
5 patentsUS6129437AOct 10, 2000
Image display apparatus
PLUS KK101 citations94
US6340237B1Jan 22, 2002
Lamp cartridge
PLUS KK57 citations92
US4979813ADec 25, 1990
Opaque projector
PLUS KK7 citations65
US4802014AJan 31, 1989
Portable transfer apparatus
PLUS KK6 citations61
US5803449ASep 8, 1998
Automatic manuscript sheet feeder
PLUS KK0 citations50