Granted Patent
Utility
US 5,784,446 · App. 08/742,498
Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling
Inventor:
John C. Stuart
Patented Case
View Patent ↗
Granted: Jul 21, 1998
Filed: Nov 1, 1996
Inventor
John C. Stuart
Assignee (at issue)
CMS Investors
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.