Granted Patent
Utility
US 4,384,813 · App. 06/238,788
Shingle stacker with shingle inverting feature
Inventors:
Douglas D. Smith, Richard N. Cunningham
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Feb 27, 1981
Inventors
Douglas D. Smith
Richard N. Cunningham
Assignee (at issue)
Manville Service 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.