Granted Patent
Utility
US 5,380,690 · App. 08/072,771
Cracking catalyst for the production of light olefins
Inventors:
Shi Zhicheng, Shi Wenyuan, Ye Yifang, Ge Xingpin, Cao Ping, Liu Shunhua, Xie Chaogang, Li Zaiting, Shu Xingtian, Yang Xiaoming, Fu-Han Wei, Zhou Meng, He Mingyuan
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Jun 7, 1993
Inventors
Shi Zhicheng
Shi Wenyuan
Ye Yifang
Ge Xingpin
Cao Ping
Liu Shunhua
Xie Chaogang
Li Zaiting
Shu Xingtian
Yang Xiaoming
Fu-Han Wei
Zhou Meng
He Mingyuan
Assignee (at issue)
CHINA PETROCHEMICAL CORPORATION
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.