Granted Patent
Utility
US 4,233,100 · App. 06/054,198
Method and apparatus for manufacturing a laminated shingle
Inventors:
Richard N. Cunningham, Douglas D. Smith, Romain E. Loeffler, deceased
Patented Case
View Patent ↗
Granted: Nov 11, 1980
Filed: Jul 2, 1979
Inventors
Richard N. Cunningham
Douglas D. Smith
Romain E. Loeffler, deceased
Assignee (at issue)
Johns Manville
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.