Granted Patent
Utility
US 4,707,909 · App. 06/894,416
Manufacture of trimmable high value polycrystalline silicon resistors
Inventor:
Richard A. Blanchard
Patented Case
View Patent ↗
Granted: Nov 24, 1987
Filed: Aug 8, 1986
Inventor
Richard A. Blanchard
Assignee (at issue)
SILICONIX INCORPORATED
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.