Patents Assigned to CMS Investors - Justia Patents Search

Patents Assigned to CMS Investors

Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling

Patent number: 5784446

Abstract: A doorbell response system can be retrofit in an existing doorbell system without requiring the incorporation of new wiring in the existing doorbell system.

Type: Grant

Filed: November 1, 1996

Date of Patent: July 21, 1998

Assignee: CMS Investors

Inventor: John C. Stuart