Granted Patent
Utility
US 4,820,587 · App. 07/004,116
Polysilicon produced by a fluid bed process
Inventors:
Marcelian F. Gautreaux, Robert H. Allen
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jan 16, 1987
Inventors
Marcelian F. Gautreaux
Robert H. Allen
Assignee (at issue)
Ethyl 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.