Granted Patent
Utility
US 5,168,764 · App. 07/559,228
Method and apparatus for taking metal samples
Inventor:
Richard A. Falk
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Jul 23, 1990
Inventor
Richard A. Falk
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.