Granted Patent
Utility
US 3,953,413 · App. 05/478,879
Supported chromium-containing catalyst and process of polymerizing 1-olefins
Inventors:
Yu-Tang Hwang, Howard L. Grimmett
Patented Case
View Patent ↗
Granted: Apr 27, 1976
Filed: Jun 13, 1974
Inventors
Yu-Tang Hwang
Howard L. Grimmett
Assignee (at issue)
Chemplex, Ltd.
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.