BBC Brown, Boveri & Company, Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4977438 Turn-off semiconductor component and use thereofExpiredMar 23, 89Dec 11, 90[H03K, H01L]
4971839 High-temperature shielding coating and method for producing itExpiredOct 06, 88Nov 20, 90[B05D, C09D]
4965017 Liquid crystal devicesExpiredJul 13, 88Oct 23, 90[C09K, G02F]
4943840 Reverse-conducting thyristorExpiredMar 18, 88Jul 24, 90[H01L]
4909859 Process for increasing the oxidation resistance and corrosion resistance of a component made of a dispersion strengthened superalloy by a surface treatmentExpiredFeb 26, 86Mar 20, 90[C21D]
4905196 Method and storage device for saving the computer status during interruptExpiredOct 05, 87Feb 27, 90[G11C]
4897785 Search system for locating values in a table using address compare circuitExpiredJun 17, 88Jan 30, 90[G06F]
4877928 Release mechanism for a high speed circuit breakerExpiredJul 21, 88Oct 31, 89[H01H]
4833886 Internal combustion engine supercharged by means of an exhaust gas turbochargerExpiredSep 07, 88May 30, 89[F02B]
4831487 Reactor switch arc-back limiting circuitExpiredJul 14, 87May 16, 89[H02H]
4829348 Disconnectable power semiconductor componentExpiredJan 27, 88May 09, 89[H01L]
4818319 Process for reducing the water vapour diffusion in a plastics composite insulator consisting of several layersExpiredMar 10, 86Apr 04, 89[H01B, B32B]
4819232 Fault-tolerant multiprocessor arrangementExpiredDec 15, 86Apr 04, 89[G06F]
4817145 Generator for generating binary ciphering sequencesExpiredOct 15, 86Mar 28, 89[H04L]
4811478 Process for the production of a lightning arrester and products produced therebyExpiredAug 31, 87Mar 14, 89[H01C]
4812107 Method of manufacturing a control wheel for the high-pressure rotor of a steam turbineExpiredFeb 24, 86Mar 14, 89[F01D]
4811212 Address transformation circuit arrangementExpiredOct 03, 86Mar 07, 89[G06F]
4808246 Composite material in rod, tube, strip, sheet or plate shape with reversible thermomechanical properties and process for its productionExpiredSep 26, 86Feb 28, 89[C23C]
4809296 Method for transmitting data via the lines of a power supply systemExpiredFeb 11, 87Feb 28, 89[H04B]
4805064 Lightning arrester having a housing with a high filler contentExpiredAug 20, 86Feb 14, 89[H02H]

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