Granted Patent
Utility
US 4,299,563 · App. 06/155,056
Cyclone processor and separator
Inventor:
Robert S. Bryant
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Jun 2, 1980
Inventor
Robert S. Bryant
Assignee (at issue)
National Gypsum Company
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.