Granted Patent
Utility
US 4,540,994 · App. 06/633,173
Releasable pen block guide
Inventor:
James Lawrence
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Jul 23, 1984
Inventor
James Lawrence
Assignee (at issue)
Sanders GmbH
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.