Granted Patent
Utility
US 5,460,416 · App. 08/100,676
Perforated fiber reinforced pipe and couplings for articulating movement
Inventors:
Ralph S. Freidrich, Ronald G. Ulrich, Ronald Douglas Johnson, Robert E. Hamilton
Patented Case
View Patent ↗
Granted: Oct 24, 1995
Filed: Aug 2, 1993
Inventors
Ralph S. Freidrich
Ronald G. Ulrich
Ronald Douglas Johnson
Robert E. Hamilton
Assignee (at issue)
Ameron, 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.