Granted Patent
Utility
US 5,621,531 · App. 08/415,663
Self-aligning sewer pipe laser
Inventors:
Richard J. Van Andel, Gary L. Utter, Gregory J. Nagel
Patented Case
View Patent ↗
Granted: Apr 15, 1997
Filed: Apr 3, 1995
Inventors
Richard J. Van Andel
Gary L. Utter
Gregory J. Nagel
Assignee (at issue)
Laser Alignment, 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.