Granted Patent
Utility
US 4,687,432 · App. 06/907,319
Apparatus for forming plastic pipe couplings
Inventors:
Andrew L. Cross, Thomas F. Moran
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Sep 15, 1986
Inventors
Andrew L. Cross
Thomas F. Moran
Assignee (at issue)
Midwest Plastic Fabricators
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.