Granted Patent
Utility
US 4,926,419 · App. 07/317,100
Priority apparatus
Inventor:
David L. Whipple
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Feb 28, 1989
Inventor
David L. Whipple
Assignee (at issue)
Wang Laboratories, Inc.
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.