Granted Patent
Utility
US 4,576,305 · App. 06/736,080
Sheet metal wall panel and integral opener structure
Inventor:
William T. Saunders
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: May 20, 1985
Inventor
William T. Saunders
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.