Granted Patent
Utility
US 5,113,590 · App. 07/716,963
Protractor
Inventors:
Bruce Shapiro, Gunar Narubin
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Jun 18, 1991
Inventors
Bruce Shapiro
Gunar Narubin
Assignee (at issue)
Creative Works, L.P.
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.