Inventor

OKUYAMA YASUSHI

5 patents

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

NIPPON ELECTRIC CO

2 patents

US4068018AJan 10, 1978

Process for preparing a mask for use in manufacturing a semiconductor device

NIPPON ELECTRIC CO70 citations91

US4255210AMar 10, 1981

Method for manufacturing a read-only memory device

NIPPON ELECTRIC CO11 citations72

NEC CORP

2 patents

US4918503AApr 17, 1990

Dynamic random access memory device having a plurality of one transistor type memory cells

NEC CORP26 citations90

US4835597AMay 30, 1989

Semiconductor device having improved multi-layer structure of insulating film and conductive film

NEC CORP25 citations88

SUMITOMO METAL MINING CO

1 patent

US3952816AApr 27, 1976

Drilling system and method of pulling it up

SUMITOMO METAL MINING CO12 citations65