Granted Patent
Utility
US 4,989,388 · App. 07/314,801
Spacer for spacing reinforcing mesh wire from the form in the manufacture of concrete pipe and the like
Inventors:
Jon A. Schmidgall, Galen G. Metzger
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Feb 24, 1989
Inventors
Jon A. Schmidgall
Galen G. Metzger
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.