Granted Patent
Utility
US 4,670,864 · App. 06/697,373
Voice interruptible alarm device
Inventor:
Harald Hoffmann
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Feb 1, 1985
Inventor
Harald Hoffmann
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.