Granted Patent
Utility
US 6,257,878 · App. 09/499,788
Preformed modular trefoil and installation method
Inventors:
Ronald Marr, Larry Shultz
Patented Case
View Patent ↗
Granted: Jul 10, 2001
Filed: Feb 8, 2000
Inventors
Ronald Marr
Larry Shultz
Assignee (at issue)
J. E. Baker Company
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.