Granted Patent
Utility
US 5,242,736 · App. 07/719,981
Seamless tube useful to make roofing battens and related method
Inventors:
Donald L. Van Erden, Juergen O. Rathgeber, Parimal M. Vadhar, John P. Wojcik
Patented Case
View Patent ↗
Granted: Sep 7, 1993
Filed: Jun 24, 1991
Inventors
Donald L. Van Erden
Juergen O. Rathgeber
Parimal M. Vadhar
John P. Wojcik
Assignee (at issue)
ILLINOIS TOOL WORKS INC.
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.