Granted Patent
Utility
US 4,476,658 · App. 06/246,328
Standing seam roof system
Inventor:
Thomas O. Johnstone
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Mar 23, 1981
Inventor
Thomas O. Johnstone
Assignee (at issue)
Alcan Aluminum 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.