Granted Patent
Utility
US 4,055,389 · App. 05/708,615
Die construction
Inventor:
Glenn L. Hayward
Patented Case
View Patent ↗
Granted: Oct 25, 1977
Filed: Jul 26, 1976
Inventor
Glenn L. Hayward
Assignee (at issue)
Leesona 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.