Granted Patent
Utility
US 4,207,293 · App. 05/857,331
Circumferential error signal apparatus for crystal rod pulling
Inventors:
Richard A. Scholl, John Cole
Patented Case
View Patent ↗
Granted: Jun 10, 1980
Filed: Dec 5, 1977
Inventors
Richard A. Scholl
John Cole
Assignee (at issue)
Varian, 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.