Granted Patent
Utility
US 6,547,221 · App. 09/991,811
Knock-down grind rail for skateboards and rollerblades
Inventors:
Frank Bork, Frederick Rieber
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: Nov 23, 2001
Inventors
Frank Bork
Frederick Rieber
Assignee (at issue)
Hedstrom Corporation
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.