Inventor

LIU HONGDU

US4 patents

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

(unassigned)

1 patent

US6493139B1Dec 10, 2002

Optical switch

25 citations88

PRIMANEX

1 patent

US6580546B2Jun 17, 2003

Faraday rotator

PRIMANEX32 citations86

PRIMANEX CORP

1 patent

US6631238B2Oct 7, 2003

Variable optical attenuator

PRIMANEX CORP20 citations77

SINO POINT TECHNOLOGY LTD

1 patent

US7412132B1Aug 12, 2008

Mini fiber optic isolator

SINO POINT TECHNOLOGY LTD19 citations76