Inventor
IIYAMA KIYOTAKA
JP20 patents
⚠️ This page may combine multiple inventors who share the name “IIYAMA KIYOTAKA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
17 patentsUS4663641AMay 5, 1987
Two-color thermosensitive recording adhesive label
RICOH KK81 citations96
US4638340AJan 20, 1987
Two-color thermosensitive recording label
RICOH KK81 citations96
US4665410AMay 12, 1987
Multi-color thermosensitive recording material
RICOH KK50 citations92
US4620204AOct 28, 1986
Two-color thermosensitive recording material
RICOH KK28 citations92
US4613878ASep 23, 1986
Two-color thermosensitive recording material
RICOH KK24 citations82
US5024699AJun 18, 1991
Leuco dyes and recording materials using the same
RICOH KK18 citations81
US4517580AMay 14, 1985
Thermosensitive recording material
RICOH KK6 citations74
US4502068AFeb 26, 1985
Thermosensitive recording material
RICOH KK10 citations74
US4925828AMay 15, 1990
Leuco dyes and recording materials using the same
RICOH KK6 citations73
US4507670AMar 26, 1985
Thermosensitive recording material
RICOH KK11 citations73
US4179407ADec 18, 1979
Catalyst bed for use in decomposition of ammonia gas
RICOH KK17 citations73
US4056824ANov 1, 1977
Developing apparatus for diazo copying machine
RICOH KK14 citations72
US4620205AOct 28, 1986
Two-color thermosensitive recording material
RICOH KK16 citations67
US4981970AJan 1, 1991
Coloring phthalide compounds
RICOH KK3 citations63
US4940691AJul 10, 1990
Coloring phthalide compounds and recording materials using the compounds as coloring component
RICOH KK4 citations63
US4880762ANov 14, 1989
Coloring phthalide compounds, method of producing the compounds and recording materials using any of the compounds as coloring component
RICOH KK2 citations63
US4845072AJul 4, 1989
Thermosensitive recording material
RICOH KK6 citations63