Granted Patent
Utility
US 4,841,877 · App. 07/160,136
Table
Inventor:
Julian A. Virtue
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Feb 25, 1988
Inventor
Julian A. Virtue
Assignee (at issue)
Virco Mfg. 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.