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Class Information
Number: 976/DIG.178
Name: Nuclear technology > Pressure vessels; containment vessels [g21c-13/00] *** (chemical or physical processes b01j-3/00; pressure vessels in general f16j-12/00) > Details (e.g., seals, supporting constructions, ventillating arrangements, tube joints with a vessel wall) [g21c-13/02] > Sealing plugs [g21c-13/06] > Closures for reactor-vessels (also rotatable) [g21c-13/06d]

Sub-classes under this class:

Class Number Class Name Patents
976/DIG.179 Seals for closures or for rotatable closures [g21c-13/06d2] 18

Patents under this class:
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Patent Number Title Of Patent Date Issued
4834937 Fluid flow-restricting seals or baffles May. 30, 1989
4786464 Cover plug of the core of a fast neutron nuclear reactor Nov. 22, 1988
4759898 Fast neutron nuclear reactor having an improved core cover plug Jul. 26, 1988
4756879 Core cover plug of a liquid metal-cooled nuclear reactor Jul. 12, 1988
4712015 Shields for nuclear reactors Dec. 8, 1987
4698199 Retractable duct connectors in a nuclear reactor Oct. 6, 1987
4687624 Liquid metal cooled fast breeder reactor Aug. 18, 1987
4678623 Modular head assembly and method of retrofitting existing nuclear reactor facilities Jul. 7, 1987
4666652 Fast neutron nuclear reactor comprising a suspended sealing slab and main vessel May. 19, 1987
4657732 High temperature reactor with spherical fuel elements Apr. 14, 1987
4645640 Refueling system with small diameter rotatable plugs Feb. 24, 1987
4639350 Cover-plug for the core of a fast neutron nuclear reactor Jan. 27, 1987
4587081 Slab for closing the vessel of a fast neutron nuclear reactor May. 6, 1986
4534140 Annular slab for closing the vessel of a fast neutron nuclear reactor Aug. 13, 1985
4508678 Liquid metal-cooled nuclear reactor Apr. 2, 1985
4479336 Concrete cover for high pressure vessels Oct. 30, 1984
4464334 Fast neutron nuclear reactors Aug. 7, 1984
4421714 Nozzle penetration for a nuclear reactor pressure vessel closure Dec. 20, 1983
4405055 Vaulted cover with flange and plurality of pipe fittings Sep. 20, 1983
4401619 Nuclear reactor sealing system Aug. 30, 1983
4366653 Locking device for a cylindrical cavity Jan. 4, 1983
4349991 Closing device for large passages in a prestressed pressure vessel Sep. 21, 1982
4330368 Cable handling system for use in a nuclear reactor May. 18, 1982
4328071 Device for guiding ducts which extend through a rotatable component May. 4, 1982
4303177 Cavity closure arrangement for high pressure vessels Dec. 1, 1981
4299662 Connecting apparatus for limited rotary or rectilinear motion Nov. 10, 1981
4293383 Nuclear reactor with equipment for preventing convection of metal vapors Oct. 6, 1981
4288292 Connecting apparatus for limited rotary of rectilinear motion (II) Sep. 8, 1981
4254982 Yoke-like attachment assembly Mar. 10, 1981
4223575 Reactor vessel stud turnout tool Sep. 23, 1980
4221418 Apparatus for handling a cover of a steam generator in an electro-nuclear station Sep. 9, 1980
4195457 Closure device for pressure vessels Apr. 1, 1980
4192717 Cover for a nuclear reactor pressure vessel Mar. 11, 1980
4184785 Axially bolted flange joint Jan. 22, 1980
4178208 Self locking drive system for rotating plug of a nuclear reactor Dec. 11, 1979
4142935 Nuclear reactor Mar. 6, 1979
4124447 Pressure vessel for nuclear reactor Nov. 7, 1978
4113564 Core disruptive accident margin seal Sep. 12, 1978
4092215 Rupture protection device for steam generators of substantially cylindrical shape, preferably of pressurized-water nuclear power plants May. 30, 1978
4078968 Sealed head access area enclosure Mar. 14, 1978
4077840 Nuclear reactor with locking-key safety mechanism Mar. 7, 1978
4071402 Nuclear reactor apparatus Jan. 31, 1978
4064000 Nuclear reactor core servicing apparatus Dec. 20, 1977
4062723 Core access system for nuclear reactor Dec. 13, 1977
4057162 Pressure vessel for nuclear reactor Nov. 8, 1977
4053356 Guide device Oct. 11, 1977
4050987 Rotating plug bearing and seal Sep. 27, 1977
4047632 Pressure vessel especially for a nuclear reactor Sep. 13, 1977
4045283 Control rod and/or instrument tree assembly Aug. 30, 1977
3990942 Removable auxiliary lid for handling the fuel elements of a nuclear reactor core Nov. 9, 1976

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