Inventor

Yu-Shan Chao

Inventor

Hsinchu, TW

Overview

8→

Patents

1991–2012

Patent span

Chemistry

Primary field (CPC C)

Patents· 8 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C08Fprimary

C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds27%

C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds27%

C07CAcyclic or carbocyclic compounds9%

C07DHeterocyclic compounds9%

C07FAcyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium or tellurium9%

C08CTreatment or chemical modification of rubbers9%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests9%

PatentTitleYear

8,273,903'Method for preparing the citraconic anhydride and method for isomerizing/dehydrating itaconic acid'2012 6,780,811'Catalyst composition for living free radical polymerization and process for polymerizing (meth) acrylic, vinyl, vinylidene, and diene monomers using the catalyst composition'2004 6,313,230'Catalyst composition for hydrogenation of conjugated diene based synthetic rubbers'2001 6,207,773'Metallocene catalyst for preparing olefin polymer'2001 5,623,047'Catalytic compositions for the preparation of poly(ethylene terephthalate) with improved color'1997 5,608,032'Catalytic compositions for the proparation of poly(ethylene terephthalate) with attenuated yellow color'1997 5,519,108'Catalytic compositions containing tetrabutyl titanate and a mixture of cocatalysts for the preparation of poly(butylene terephthalate)'1996 5,008,435'Preparation of urethanes'1991

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1991–2012Patents assigned to IND TECH RES INST (8)· patent assignee history

1991Based in Kaohsiung, CN· patent location history

1996–2012Based in Hsinchu, TW· patent location history

2001Patents assigned to CHI MEI CORP (1)· patent assignee history

2001Patents assigned to CHINESE PETROLEUM CORP (1)· patent assignee history

2012Patents assigned to CHAO YU-SHAN (1)· patent assignee history

2012Patents assigned to HSU HSI-YEN (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
IND TECH RES INST	8	1991–2012
CHAO YU-SHANself	1	2012
CHI MEI CORP	1	2001
CHINESE PETROLEUM CORP	1	2001
HSU HSI-YEN	1	2012

Locations

Location	Patents	Span
Hsinchu, TW	7	1996–2012
Kaohsiung, CN	1	1991