Inventor

KUMAGAI KATSUYOSHI

JP2 patents

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

ALPINE ELECTRONICS INC

1 patent

US4674592AJun 23, 1987

Diaphragm for use in electro-acoustic transducer

ALPINE ELECTRONICS INC20 citations78

PIONEER ELECTRONIC CORP

1 patent

US4451609AMay 29, 1984

Flame-retarded acoustic diaphragm

PIONEER ELECTRONIC CORP4 citations60