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Class Information
Number: 335/247
Name: Electricity: magnetically operated switches, magnets, and electromagnets > Magnets and electromagnets > With magneto-mechanical motive device (e.g., electromagnet with armature) > Alternating current type > With chatter- or noise-preventing means
Description: Subject matter including means to prevent or decrease chatter or hum noise of the armature.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6794971 |
System and method for removing noise from AC operated electro magnets |
Sep. 21, 2004 |
| 5565832 |
Solenoid with magnetic control of armature velocity |
Oct. 15, 1996 |
| 5243313 |
Tractive magnet with asymmetric permanent air gap |
Sep. 7, 1993 |
| 4771983 |
Magnetic flow control valve |
Sep. 20, 1988 |
| 4757293 |
Solenoid for direct mounting on engines |
Jul. 12, 1988 |
| 4673163 |
Electromagnetic actuators |
Jun. 16, 1987 |
| 4638279 |
Noiseless electromagnet and a contactor using such an electromagnet |
Jan. 20, 1987 |
| 4472697 |
Armature assembly for machine tool relay |
Sep. 18, 1984 |
| 4451809 |
Electromagnetic device |
May. 29, 1984 |
| 4381491 |
Device to slow solenoid actuation motion |
Apr. 26, 1983 |
| 4286243 |
Electrical switch constructions and methods of making the same |
Aug. 25, 1981 |
| 4177440 |
Moving-armature electromagnetic device |
Dec. 4, 1979 |
| 4042897 |
A-C magnet with a shorting ring |
Aug. 16, 1977 |
| 3992687 |
Buzz-proof solenoid |
Nov. 16, 1976 |
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