Granted Patent
Utility
US 4,428,811 · App. 06/481,953
Rapid rate reactive sputtering of a group IVb metal
Inventors:
William D. Sproul, James R. Tomashek
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Apr 4, 1983
Inventors
William D. Sproul
James R. Tomashek
Assignee (at issue)
BorgWarner Inc.
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.