Granted Patent
Utility
US 4,854,091 · App. 07/120,865
Abrasive swivel assembly and method
Inventors:
Mohamed A. Hashish, Mark Marvin
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Nov 16, 1987
Inventors
Mohamed A. Hashish
Mark Marvin
Assignee (at issue)
Flow Industries, 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.