Granted Patent
Utility
US 5,930,858 · App. 08/811,508
Toothbrush and method of signaling the length of brushing time
Inventor:
Philipp Jung
Patented Case
View Patent ↗
Granted: Aug 3, 1999
Filed: Mar 4, 1997
Inventor
Philipp Jung
Assignee (at issue)
The Braun 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.