Granted Patent
Utility
US 4,909,897 · App. 07/346,028
Local oxidation of silicon process
Inventor:
Shane Duncan
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Jun 14, 1989
Inventor
Shane Duncan
Assignee (at issue)
Plessey Overseas Limited
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.