CRA Services Limited

Patent Owner

Watch Compare Add to Portfolio

Stats

Details

Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C21B MANUFACTURE OF IRON OR STEEL 221
 
  
 
C01G COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F 138

Top Patents (by citation)

Upgrade to the Professional Level to View Top Patents for this Owner. Learn More

Recent Publications

  • No Recent Publications to Display

Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5489325 Process for producing metals and metal alloys in a smelt reduction vesselNov 03, 92Feb 06, 96[C21B]
5316268 Method for increasing the durability of refractory vessel liningsApr 30, 93May 31, 94[C21B]
5260040 Extraction and recovery of goldSep 12, 91Nov 09, 93[C01G]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5647888 Process for producing metals and metal alloys in a smelt reduction vesselExpiredMay 02, 95Jul 15, 97[C21B]
5364446 Heating and treatment of particulate materialExpiredApr 08, 92Nov 15, 94[C04B, B01J]
5302184 Manufacture of ferroalloys using a molten bath reactorExpiredSep 26, 91Apr 12, 94[C22C]
5262136 Recovery of gold and silver from complex refractory sulphide ores by cyanidisation and oxidation with peroxidesExpiredDec 24, 91Nov 16, 93[C01G]
5227116 Manufacture of iron and steel in a duplex smelter and solid state oxide suspension prereducerExpiredJun 04, 92Jul 13, 93[C21B]
5201940 Pre-heating and pre-reduction of a metal oxideExpiredSep 26, 91Apr 13, 93[C22B]
5198019 Manufacture of iron and steel in a duplex smelter and solid state oxide suspension prereducerExpiredJun 20, 91Mar 30, 93[C21B]
5088331 Apparatus for measuring a mass streamExpiredNov 30, 90Feb 18, 92[G01F]
4951825 Apparatus for classifying particulate materialExpiredMay 25, 89Aug 28, 90[B07C]
4758244 Upgrading solid fuelsExpiredDec 08, 86Jul 19, 88[C10L]
4741770 Zinc smelting process using oxidation zone and reduction zoneExpiredApr 02, 86May 03, 88[C22B]

Top Inventors for This Owner

Upgrade to the Professional Level to View Top Inventors for this Owner. Learn More

We are sorry but your current selection exceeds the maximum number of comparisons () for this membership level. Upgrade to our Level for up to -1 comparisons!

We are sorry but your current selection exceeds the maximum number of portfolios (0) for this membership level. Upgrade to our Level for up to -1 portfolios!.