Inventor
ISHIKAWA SEIICHI
JP19 patents
⚠️ This page may combine multiple inventors who share the name “ISHIKAWA SEIICHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD
9 patentsUS4888808ADec 19, 1989
Digital equalizer apparatus enabling separate phase and amplitude characteristic modification
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD64 citations96
US4899390AFeb 6, 1990
Thin speaker having an enclosure within an open portion and a closed portion
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD44 citations92
US4896285AJan 23, 1990
Calculation of filter factors for digital filter
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD26 citations92
US5073946ADec 17, 1991
Thin speaker having an enclosure with an open portion and a closed portion
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD19 citations82
US4426556AJan 17, 1984
Electrodynamic loudspeaker
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD22 citations80
US5051942ASep 24, 1991
Method and apparatus for calculating filter factors
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD12 citations73
US5023913AJun 11, 1991
Apparatus for changing a sound field
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD16 citations72
US4722009AJan 26, 1988
Tone restoring apparatus
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD5 citations62
US4484383ANov 27, 1984
Method of manufacturing a speaker diaphragm
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD4 citations62