Granted Patent
Utility
US 4,568,960 · App. 06/199,881
Blocked impurity band detectors
Inventors:
Michael D. Petroff, Maryn G. Stapelbroek
Patented Case
View Patent ↗
Granted: Feb 4, 1986
Filed: Oct 23, 1980
Inventors
Michael D. Petroff
Maryn G. Stapelbroek
Assignee (at issue)
Rockwell International Corporation
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.