Granted Patent
Utility
US 4,340,574 · App. 06/182,148
Process for the production of ultrahigh purity silane with recycle from separation columns
Inventor:
Larry M. Coleman
Patented Case
View Patent ↗
Granted: Jul 20, 1982
Filed: Aug 28, 1980
Inventor
Larry M. Coleman
Assignee (at issue)
Union Carbide 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.