Granted Patent
Utility
US 5,052,155 · App. 07/391,817
Apparatus for the treatment of articles by high velocity impacting thereof with a particulate abrasive material
Inventors:
Robert J. Blacka, Francis J. Verderame
Patented Case
View Patent ↗
Granted: Oct 1, 1991
Filed: Aug 10, 1989
Inventors
Robert J. Blacka
Francis J. Verderame
Assignee (at issue)
EMC Tech Co., Ltd.
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.