Liquid contact > Piston or plunger means > Patents

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Class Information
Number: 200/209
Name: Electricity: circuit makers and breakers > Liquid contact > Piston or plunger means
Description: Subject matter wherein piston means (e.g., rod or plunger) are used to force the conductive liquid into electrical connection with the switch contacts.

Sub-classes under this class:

Class Number	Class Name	Patents
200/210	Contact attached to or unitary with piston or plunger	5

Patents under this class:

Patent Number	Title Of Patent	Date Issued
7234233	Method of manufacturing an electromagnetic relay	Jun. 26, 2007
6762378	Liquid metal, latching relay with face contact	Jul. 13, 2004
4208643	Magnetically actuated mercury switch	Jun. 17, 1980
4172251	Self-encoding key switch and keyboard and keyboard system utilizing the same	Oct. 23, 1979
4072835	Fluid type inertia switch having resettable plunger and cone shaped retainer	Feb. 7, 1978
4036827	Conductive liquid switches	Jul. 19, 1977
3967134	Electrical control apparatus	Jun. 29, 1976