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Class Information
Number: 379/331
Name: Telephonic communications > Centralized switching system > Having protective circuit
Description: Subject matter which prevents damage to the circuits of the central switching system from improper conditions.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7039685 |
Method and apparatus for conducting subscriber's phone testing remotely via the internet |
May. 2, 2006 |
| 6914976 |
TELECOMMUNICATIONS CUSTOMER SERVICE TERMINAL HAVING ELECTRONIC COMPONENTS SEALED IN A FIRST COMPARTMENT AND HAVING AN UNSEALED COMPARTMENT THAT CONTAINS AN INSULATION DISPLACEMENT CONNECTOR BO |
Jul. 5, 2005 |
| 6760424 |
Method for establishing a protected communication segment between two network elements of a telecommunication network as well as a corresponding telecommunication network |
Jul. 6, 2004 |
| 6381477 |
Method and apparatus for protecting a circuit module in a communication device |
Apr. 30, 2002 |
| 6359770 |
Power distribution circuit board with bullet connectors |
Mar. 19, 2002 |
| 6104805 |
Swivel cable mounting arrangement requiring no wiring feed through hole |
Aug. 15, 2000 |
| 6035032 |
Multi-layered foldable cross connect field |
Mar. 7, 2000 |
| 6002570 |
Residential protection service center |
Dec. 14, 1999 |
| 5970136 |
IDSN capacity expansion for remote terminal sites |
Oct. 19, 1999 |
| 5802168 |
ISDN capacity expansion for remote terminal sites |
Sep. 1, 1998 |
| 5734542 |
Dual-line dual-voltage telecommunications surge protector |
Mar. 31, 1998 |
| 5696820 |
Telephone and data communications line conditioner system |
Dec. 9, 1997 |
| 5691872 |
Single line, multiple line telecommunications surge protector |
Nov. 25, 1997 |
| 5509066 |
Telephone distribution frame element, in particular a connection strip |
Apr. 16, 1996 |
| 5425099 |
Positive temperature coefficient thermistor device |
Jun. 13, 1995 |
| 5295185 |
Ringing signal generation circuit with protection against overvoltage |
Mar. 15, 1994 |
| 5161183 |
Overvoltage protection circuits |
Nov. 3, 1992 |
| 5125027 |
Central office line interface circuit for an analog network private telephone installation |
Jun. 23, 1992 |
| 5121284 |
Driver circuit with feedback for limiting undershoot/overshoot and method |
Jun. 9, 1992 |
| 5077630 |
Integrated services digital network terminating resistor with line fault protector |
Dec. 31, 1991 |
| 5034846 |
Plug protector |
Jul. 23, 1991 |
| 5003588 |
Circuit arrangement for protecting electronic interface circuit of subscriber line circuits |
Mar. 26, 1991 |
| 4924345 |
Combined transient voltage and sneak current protector |
May. 8, 1990 |
| 4905119 |
Solid state overvoltage protection circuit |
Feb. 27, 1990 |
| 4878146 |
Line protector |
Oct. 31, 1989 |
| 4876620 |
Protection devices and arrangements for telephone lines |
Oct. 24, 1989 |
| 4856060 |
Solid state telephone protector module |
Aug. 8, 1989 |
| 4827502 |
Environmentally protected housing for using central office protector modules outdoors |
May. 2, 1989 |
| 4345294 |
Overvoltage-arrester device for terminal- or junction blocks in telecommunication equipment |
Aug. 17, 1982 |
| 4328524 |
Cable head with protection for a telephone exchange distributor |
May. 4, 1982 |
| 4313147 |
Protective device for communication system |
Jan. 26, 1982 |
| 4309736 |
Protective device for low-voltage lines |
Jan. 5, 1982 |
| 4250531 |
Switch-arc preventing circuit |
Feb. 10, 1981 |
| 4202025 |
A circuit for protecting an electronic exchange against overloads |
May. 6, 1980 |
| 4159500 |
Modular line protector |
Jun. 26, 1979 |
| 4156153 |
Electronic switch |
May. 22, 1979 |
| 4118603 |
DC signaling circuit for use in conjunction with isolation transformers |
Oct. 3, 1978 |
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