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Class Information
Number: 174/12R
Name: Electricity: conductors and insulators > With fluids or vacuum > With expansion and contraction means

Sub-classes under this class:

Class Number Class Name Patents
174/13 Built into conduit or cable 21
174/12BH Expansion bushings 17

Patents under this class:

Patent Number Title Of Patent Date Issued
7902951 Hermetically sealed electrical apparatus Mar. 8, 2011
6384322 Hermetic enclosure having air pressure adjustable function May. 7, 2002
5976226 Means to ensure a minimum of gas content in liquids used for heat exchange and insulating purposes with complementary means for liquid expansion into vessels with variable volumes Nov. 2, 1999
5629495 Waterproof box-like casing May. 13, 1997
5466890 Expansion joint for an electrical conduit which is electrically grounded through the expansion joint Nov. 14, 1995
5466890 Expansion joint for an electrical conduit which is electrically grounded through the expansion joint Nov. 14, 1995
5324886 Insulating-liquid immersed electrical machine Jun. 28, 1994
5122926 Housing for an electric device Jun. 16, 1992
5047744 High voltage fluid filled transformer Sep. 10, 1991
4759811 Method for repair or accessing pressurized cable Jul. 26, 1988
4700272 Apparatus and method for compensation of thermal expansion of cooling fluid in enclosed electronic packages Oct. 13, 1987
4693540 Pressure regulating devices Sep. 15, 1987
4609900 High-voltage transformer with liquid cooling Sep. 2, 1986
4580002 Method and apparatus for replacing flammable oil in an electrical cable and cable so treated Apr. 1, 1986
4555587 Enclosure for a power supply Nov. 26, 1985
4502032 Ebullition cooled transformer Feb. 26, 1985
4331830 Housing for electrical components May. 25, 1982
4251681 Compressed gas insulated high voltage line Feb. 17, 1981
4145679 Vaporization cooled and insulated electrical inductive apparatus Mar. 20, 1979
4097681 Interface for high voltage oil-filled and gas-filled apparatus Jun. 27, 1978
4092484 Arrangement to prevent corona discharge and electric rupture in high voltage electrical components May. 30, 1978
4066496 Cryogenic expansion joint for large superconducting magnet structures Jan. 3, 1978
4058671 Electrical penetration assembly Nov. 15, 1977
4057453 Method for manufacturing and laying out phase cores for oil-filled cables and a device for accomplishing same Nov. 8, 1977
4053700 Coupling flex-plate construction for gas-insulated transmission lines Oct. 11, 1977
3963297 Underwater pressure compensated electrical connector Jun. 15, 1976
3934453 Conservator system Jan. 27, 1976

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