Granted Patent
Utility
US 4,597,693 · App. 06/761,217
Method and apparatus for installing highway drainage mat
Inventors:
Charles R. McQuary, Barry J. Dempsey
Patented Case
View Patent ↗
Granted: Jul 1, 1986
Filed: Jul 31, 1985
Inventors
Charles R. McQuary
Barry J. Dempsey
Assignee (at issue)
Monsanto 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.