Granted Patent
Utility
US 4,243,427 · App. 05/853,345
High concentration phosphoro-silica spin-on dopant
Inventor:
Raymond DiBugnara
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Nov 21, 1977
Inventor
Raymond DiBugnara
Assignee (at issue)
TRW 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.