Granted Patent
Utility
US 4,935,131 · App. 07/280,552
Dual-flow band screen conversion apparatus
Inventor:
Dennis Pindar
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Dec 6, 1988
Inventor
Dennis Pindar
Assignee (at issue)
Greenbank Engineering Group, 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.