Granted Patent
Utility
US 5,657,603 · App. 08/588,021
Preparing sheet metal and fabricating roofing shingles
Inventors:
Robert R. Goodhart, Jane M. Brown, William E. Carnahan
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Jan 17, 1996
Inventors
Robert R. Goodhart
Jane M. Brown
William E. Carnahan
Assignee (at issue)
Weirton Steeel 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.