Inventor
MURAYAMA FUMIO
JP17 patents
⚠️ This page may combine multiple inventors who share the name “MURAYAMA FUMIO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
PIONEER ELECTRONIC CORP
13 patentsUS4821331AApr 11, 1989
Coaxial speaker unit
PIONEER ELECTRONIC CORP58 citations95
US5793002AAug 11, 1998
Loudspeaker vibrating diaphragm and methods for its production
PIONEER ELECTRONIC CORP21 citations92
US6343136B2Jan 29, 2002
Speaker apparatus and manufacturing method thereof
PIONEER ELECTRONIC CORP23 citations91
US5008945AApr 16, 1991
Water-proof speaker unit
PIONEER ELECTRONIC CORP34 citations91
US4965837AOct 23, 1990
Environmentally resistant loudspeaker
PIONEER ELECTRONIC CORP100 citations91
US4451928AMay 29, 1984
Multi-speaker system for use in automobiles
PIONEER ELECTRONIC CORP20 citations82
US5297212AMar 22, 1994
Loudspeaker system installed on an automobile door and including a woofer and a tweeter
PIONEER ELECTRONIC CORP18 citations74
US6030561AFeb 29, 2000
Methods for making a loudspeaker vibrating diaphragm
PIONEER ELECTRONIC CORP7 citations73
US6817084B2Nov 16, 2004
Method for manufacturing a speaker apparatus
PIONEER ELECTRONIC CORP12 citations72
US4953220AAug 28, 1990
Mobile speaker system having an illumination effect
PIONEER ELECTRONIC CORP11 citations70
US5822444AOct 13, 1998
Loudspeaker
PIONEER ELECTRONIC CORP9 citations68
US4924965AMay 15, 1990
Speaker system
PIONEER ELECTRONIC CORP5 citations63
US4837835AJun 6, 1989
Speaker system for motor vehicles with an alarm device
PIONEER ELECTRONIC CORP4 citations62