Granted Patent
Utility
US 4,326,426 · App. 06/149,378
Molded sand insulated sampler
Inventor:
Richard A. Falk
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: May 13, 1980
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.