Inventor

KUMAGAI SEIJI

JP22 patents

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

KUMAGAI SEIJI

SONY CORP

Method to manufacture magnetic tunneling elements using inductively coupled plasma

Magnetic tunneling junction device

Magnetic tunneling element and manufacturing method therefor

Magnetic head with magnetic tunnel element in which induced magnetic field changes relative angle of magnetization which affects tunnel current

Magnetic resistance element having four magnetization states and a magnetic device using the same

Magnetic tunnel device

Rotary magnetic head apparatus with circuitry for driving head and circuitry for transmitting output signals in noncontact fashion disposed on rotary drums

Magnetic head core arrangement having medium facing surface sides formed of single-crystal ferrite

Magnetic tunnel device, method of manufacture thereof, and magnetic head

Manufacturing method for magnetic head

Magnetic head

Magnetic head

SUMITOMO ELECTRIC INDUSTRIES

Method of making optical module

Receiver circuit for optical communication

Receiving circuit and optical receiving circuit

Receiving circuit and optical receiver

Transimpedance amplifier circuit

MITSUBISHI SHINDO KK

Copper alloy sheet for connectors and connectors formed of same

Copper alloy lead material for leads of a semiconductor device

TAKAYAMA JUN

Magnetic tape, magnetic tape apparatus, servo pattern recording apparatus, magnetic tape producing method, and magnetic tape recording method

HOKKAI CAN

Device for feeding can barrels

DEXERIALS CORP

Inorganic polarizing plate, method of manufacturing the same, and optical instrument