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Class Information
Number: 307/137
Name: Electrical transmission or interconnection systems > Switching systems > With operation facilitating feature > Switch contact conditioning
Description: Subject matter having means for conditioning switch contacts.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7550878 |
Circuit for preventing corrosion of contact |
Jun. 23, 2009 |
| 7482714 |
Preventive maintenance tapping and duty cycle monitor for voltage regulator |
Jan. 27, 2009 |
| 7408275 |
Preventive maintenance tapping and duty cycle monitor for voltage regulator |
Aug. 5, 2008 |
| 7362011 |
Apparatus for preventing corrosion of contact |
Apr. 22, 2008 |
| 7291940 |
Pressure sensitive switches including touch sensor structures |
Nov. 6, 2007 |
| RE39446 |
Power filter circuit responsive to supply system fault conditions |
Dec. 26, 2006 |
| 7155603 |
Circuit arrangement for detecting the state of at least one electrical switch |
Dec. 26, 2006 |
| 7109721 |
Method and electronic circuit for regenerating an electrical contact |
Sep. 19, 2006 |
| 7106066 |
Micro-electromechanical switch performance enhancement |
Sep. 12, 2006 |
| 7084530 |
Simultaneous switching output bounce reduction device and method |
Aug. 1, 2006 |
| 7049714 |
Method for determining the condition of a rotary switch |
May. 23, 2006 |
| 6930409 |
Electromechanical switching device |
Aug. 16, 2005 |
| 6538347 |
Electrical switchgear with synchronous control system and actuator |
Mar. 25, 2003 |
| 6291911 |
Electrical switchgear with synchronous control system and actuator |
Sep. 18, 2001 |
| 6137193 |
Controller for relay |
Oct. 24, 2000 |
| 6040969 |
Power filter circuit responsive to supply system fault conditions |
Mar. 21, 2000 |
| 6020692 |
Marco lamp life extension in installation for ADI, AEI |
Feb. 1, 2000 |
| 6002559 |
Contractor tip cleaning circuit |
Dec. 14, 1999 |
| 5844331 |
Process for monitoring the wear of at least one contact in a switching device and switching device designed thereof |
Dec. 1, 1998 |
| 5729167 |
Low power consumption switch interface circuit |
Mar. 17, 1998 |
| 5689143 |
Arrangement of resistors for switching of capacitive loads in an electromagnetic switching device |
Nov. 18, 1997 |
| 5679986 |
Synchronization of switchgear switching to waveform indices |
Oct. 21, 1997 |
| 5672919 |
Low current binary input subsystem |
Sep. 30, 1997 |
| 5616972 |
Switching arrangement with switching contacts and an inductive load |
Apr. 1, 1997 |
| 5563541 |
Load current detection circuit |
Oct. 8, 1996 |
| 5523633 |
Corrosion preventing circuit for switch |
Jun. 4, 1996 |
| 5502609 |
Electric circuitry for preventing contactor tip contamination in dry switching applications |
Mar. 26, 1996 |
| 5258654 |
Computer-checking of the position of a switch whose contacts where oxidized |
Nov. 2, 1993 |
| 5179290 |
System of maintaining clean electrical contacts |
Jan. 12, 1993 |
| 5028809 |
Computer bus structure permitting replacement of modules during operation |
Jul. 2, 1991 |
| 4914315 |
Method for loosening the contacts of a sticking relay as well as circuit arrangement for carrying out the method |
Apr. 3, 1990 |
| 4864157 |
Reduced arcing contact switching circuit |
Sep. 5, 1989 |
| 4851707 |
"Fritting" technique and apparatus for improving the sound of switches and connectors in audio circuits |
Jul. 25, 1989 |
| 4772809 |
Switching circuit and a relay device employed to prevent arcing |
Sep. 20, 1988 |
| 4769737 |
Circuit for driving a relay used in an AC circuit, with a protection against contact welding |
Sep. 6, 1988 |
| 4636907 |
Arcless circuit interrupter |
Jan. 13, 1987 |
| 4550285 |
Load-switching circuit for antiparallel thyristor networks and a tapped transformer |
Oct. 29, 1985 |
| 4301489 |
Arcless tap changer utilizing static switching |
Nov. 17, 1981 |
| 4276484 |
Method and apparatus for controlling current in inductive loads such as large diameter coils |
Jun. 30, 1981 |
| 4134026 |
Mechanical switch circuit comprising contact conditioning means |
Jan. 9, 1979 |
| 4011464 |
Low energy switching circuit |
Mar. 8, 1977 |
| 3986039 |
Toggle switch/indicator circuit |
Oct. 12, 1976 |
| 3968381 |
Arc type switch |
Jul. 6, 1976 |
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