Granted Patent
Utility
US 4,988,255 · App. 07/314,041
Unpackaging machine
Inventor:
Dalyn C. Hoffman
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Feb 22, 1989
Inventor
Dalyn C. Hoffman
Assignee (at issue)
The Upjohn Co.
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.