Granted Patent
Utility
US 5,230,368 · App. 07/931,689
Chemical intake system
Inventor:
Robert C. Berfield
Patented Case
View Patent ↗
Granted: Jul 27, 1993
Filed: Aug 18, 1992
Inventor
Robert C. Berfield
Assignee (at issue)
SHOP VAC CORPORATION
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.