Granted Patent
Utility
US 6,185,294 · App. 09/018,325
Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling
Inventors:
O. Joseph Chornenky, Michael G. Maxson, John C. Stuart
Patented Case
View Patent ↗
Granted: Feb 6, 2001
Filed: Feb 3, 1998
Inventors
O. Joseph Chornenky
Michael G. Maxson
John C. Stuart
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.