Granted Patent
Utility
US 4,784,840 · App. 07/114,453
Polysilicon fluid bed process and product
Inventors:
Marcelian F. Gautreaux, Robert H. Allen
Patented Case
View Patent ↗
Granted: Nov 15, 1988
Filed: Oct 28, 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.