Gutehoffnungshutte Stockrade AG

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4384818 Method and apparatus for limiting the end thrust of turbo compressors by means of a blowoff controlExpiredDec 06, 79May 24, 83[F04D]
4341506 Apparatus for the generation of compressed airExpiredAug 14, 79Jul 27, 82[F01M, F04B]
4298310 Process and apparatus for prevention of surging in turbocompressorsExpiredJun 27, 79Nov 03, 81[F04D]
4297083 Positive control system for piston compressor valvesExpiredNov 07, 79Oct 27, 81[F04B]
4278451 Apparatus for extracting granular or finely divided solid materials from a gas under pressureExpiredJul 05, 79Jul 14, 81[B01D]
4266888 Spherical joint for connecting a concrete tower supporting a water surface foundation to a sea foundationExpiredDec 14, 78May 12, 81[E02B]
4256345 Scraper chain conveyor with rack for the chainless feed of winning machinesExpiredNov 15, 79Mar 17, 81[E21C]
4249723 Cooling device for smelting plantsExpiredJun 11, 79Feb 10, 81[F27B]
4241762 Composite underground fluid conduit of concrete and steel sectionsExpiredFeb 27, 79Dec 30, 80[F16L]
4239290 Hydromechanical planer with cutting and breaking headsExpiredJul 12, 79Dec 16, 80[E21C]
4239444 Power shovelExpiredMar 28, 78Dec 16, 80[B66F]
4236630 Extensible telescopic coal bunker for subsurface miningExpiredSep 20, 78Dec 02, 80[B65G]
4217954 Cooling plate for a furnace in a metallurgical plantExpiredJan 29, 79Aug 19, 80[F28F, C21B]
4212599 Method and device for regulating the output quantity of compressed medium of single and multi-stage screw and turbo compressor systemsExpiredAug 18, 78Jul 15, 80[F04C]
4200400 Mixing car for transporting molten metalsExpiredDec 22, 78Apr 29, 80[B01F]
4181363 Mining method and mining machine for cutting away hard mineral materialsExpiredMar 28, 78Jan 01, 80[E21C]

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