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Class Information
Number: 379/169
Name: Telephonic communications > Private (e.g., house or intercom) or single line system > Lockout > Central power source
Description: Subject matter having a single energy source for the entire system.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7293182 |
Methods and apparatus for powering a data communications port |
Nov. 6, 2007 |
| 6965672 |
Electronic switching system |
Nov. 15, 2005 |
| 6952785 |
Methods and apparatus for powering a data communications port |
Oct. 4, 2005 |
| 6321094 |
Access method through radio mobile communication system |
Nov. 20, 2001 |
| 6185294 |
Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling |
Feb. 6, 2001 |
| 5920617 |
Sensor system with PT1 measuring device |
Jul. 6, 1999 |
| 5905787 |
Method and apparatus for installing telephone intercom--voice messaging apparatus at doorbell for dwelling |
May. 18, 1999 |
| 5708701 |
Power line telephone communications system having on hook digital voiceband messaging |
Jan. 13, 1998 |
| 5566233 |
Communication controlling apparatus for a single-line telephone with extensions thereto |
Oct. 15, 1996 |
| 5228078 |
Two-wire intercom with hands-free function |
Jul. 13, 1993 |
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