Granted Patent
Utility
US 5,313,713 · App. 07/930,960
Electronic level with display scale and audible tone scale
Inventors:
Charles E. Heger, Donald D. Kook
Patented Case
View Patent ↗
Granted: May 24, 1994
Filed: Aug 14, 1992
Inventors
Charles E. Heger
Donald D. Kook
Assignee (at issue)
Zircon 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.