Granted Patent
Utility
US 6,817,589 · App. 09/683,818
Apparatus and method for removing joint rings from cured concrete products
Inventors:
Jon A. Schmidgall, Ronald D. Schmidgall, David Stoller
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Feb 19, 2002
Inventors
Jon A. Schmidgall
Ronald D. Schmidgall
David Stoller
Assignee (at issue)
Hawkeye Concrete Products Co.
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.