Inventor

SAKURAI HIROFUMI

JP5 patents

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

HITACHI LTD

3 patents

US5987460ANov 16, 1999

Document retrieval-assisting method and system for the same and document retrieval service using the same with document frequency and term frequency

HITACHI LTD223 citations96

US5501583AMar 26, 1996

Turbo vacuum pump

HITACHI LTD18 citations72

US5380171AJan 10, 1995

Turbo vacuum pump

HITACHI LTD9 citations72

NEC CORP

1 patent

US6304118B1Oct 16, 2001

Synchronous circuit having circuit for detecting phase error at center of reference signal

NEC CORP8 citations68

NEC ELECTRONICS CORP

1 patent

US7679679B2Mar 16, 2010

Synchronous detector

NEC ELECTRONICS CORP0 citations49