Inventor

YUAN SHIYI

CN2 patents

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

PETROCHINA CO LTD

1 patent

US7304116B2Dec 4, 2007

Braided comb-shaped salt-resistant polymer thickening agent

PETROCHINA CO LTD1 citations42

LIU CHUNDE

1 patent

US9540559B2Jan 10, 2017

Betaine surfactants and preparation methods and uses thereof

LIU CHUNDE0 citations31