Granted Patent
Utility
US 4,933,017 · App. 07/164,131
Apparatus and method for opening drains
Inventor:
Henry G. Brzoska
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Mar 4, 1988
Inventor
Henry G. Brzoska
Assignee (at issue)
Lemaks Industries, Inc.
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.