Granted Patent
Utility
US 5,905,787 · App. 08/811,498
Method and apparatus for installing telephone intercom--voice messaging apparatus at doorbell for dwelling
Inventor:
John C. Stuart
Patented Case
View Patent ↗
Granted: May 18, 1999
Filed: Mar 5, 1997
Inventor
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.