Granted Patent
Utility
US 4,835,357 · App. 07/209,013
Sheet metal laser welding
Inventor:
Calvin W. Schalk
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Jun 20, 1988
Inventor
Calvin W. Schalk
Assignee (at issue)
WILLIAMS INTERNATIONAL CO., L.L.C.
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.