P

Inventor

OYA KEIJI

JP8 patents
⚠️ This page may combine multiple inventors who share the name “OYA KEIJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

ADEKA ARGUS CHEMICAL CO LTD

4 patents
US4980336ADec 25, 1990

Heat-sensitive recording material

ADEKA ARGUS CHEMICAL CO LTD6 citations71
US4944980AJul 31, 1990

Optical recording material

ADEKA ARGUS CHEMICAL CO LTD8 citations71
US5081099AJan 14, 1992

Heat-sensitive recording material

ADEKA ARGUS CHEMICAL CO LTD5 citations60
US4918046AApr 17, 1990

Heat-sensitive recording material

ADEKA ARGUS CHEMICAL CO LTD4 citations60

SONY CORP

2 patents
US7316836B2Jan 8, 2008

Optical recording medium

SONY CORP9 citations82
US8029976B2Oct 4, 2011

Optical recording medium and optical recording-reproducing method using thereof

SONY CORP2 citations60

ASAHI DENKA KOGYO KK

2 patents
US5728646AMar 17, 1998

Heat-sensitive recording material

ASAHI DENKA KOGYO KK5 citations60
US5607894AMar 4, 1997

Heat-sensitive recording material

ASAHI DENKA KOGYO KK2 citations54