Granted Patent
Utility
US 4,588,420 · App. 06/399,592
Methods of manufacturing abrasive articles
Inventor:
Vernon K. Charvat
Patented Case
View Patent ↗
Granted: May 13, 1986
Filed: Jul 22, 1982
Inventor
Vernon K. Charvat
Assignee (at issue)
Superior Finishes 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.