Granted Patent
Utility
US 4,933,149 · App. 06/780,273
Fluidized bed polymerization reactors
Inventors:
Seung J. Rhee, Larry L. Simpson
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Sep 26, 1985
Inventors
Seung J. Rhee
Larry L. Simpson
Assignee (at issue)
Union Carbide Chemicals & Plastics
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.