Granted Patent
Utility
US 4,653,236 · App. 06/797,672
Coated abrasive disc
Inventors:
Philip M. Grimes, John R. Grimes
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Nov 13, 1985
Inventors
Philip M. Grimes
John R. Grimes
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.