Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 6, 2001
Grant Date -
N/A
app pub date -
Feb 3, 1998
filing date -
Nov 1, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A doorbell response system in used in a dwelling including a telephone line and a telephone. The doorbell response system includes a doorbell, doorbell button, speaker, microphone, dialer to initiate the dialing of a telephone number, connection between the microphone and speaker, a system for eliminating the dial tone in the telephone line for a selected period of time so a person can communicate over the microphone and speaker, a system for dialing a number when the dialer is activated, a battery for the doorbell and doorbell button and telephone, and a trickle charge from the telephone line to the battery.
First Claim
Family
International Classification(s)
- Non-US Classification not provided for expired patents
Cited Art Landscape
Patent Citation Ranking
- Citation Ranking not provided for expired patents
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