Granted Patent
Utility
US 6,644,438 · App. 10/235,570
Pole climbing and safety device
Inventors:
Ezra T. Chang, Ronald A. Smith
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Sep 6, 2002
Inventors
Ezra T. Chang
Ronald A. Smith
Assignee (at issue)
SENTERA, 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.