Granted Patent
Utility
US 4,742,020 · App. 06/680,140
Multilayering process for stress accommodation in deposited polysilicon
Inventor:
Pradip K. Roy
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Feb 1, 1985
Inventor
Pradip K. Roy
Assignee (at issue)
American Telephone and Telegraph Company, AT&T Bell Laboratories
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.