AK STEEL CORPORATION

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C23G CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS 49
 
  
 
B05C APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL 342
 
  
 
B22D CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES 346
 
  
 
H01F MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES 381
 
  
 
B05D PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL 285
 
  
 
B08B CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL 256
 
  
 
B21D WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING 254
 
  
 
C21D MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS 243
 
  
 
C21C PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL 117
 
  
 
C22C ALLOYS 171

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6929705 Antimicrobial coated metal sheetAug 23, 01Aug 16, 05[C23C]
6645306 Hydrogen peroxide pickling scheme for stainless steel gradesApr 09, 02Nov 11, 03[C23G]
6599371 Hydrogen peroxide pickling scheme for silicon-containing electrical steel gradesApr 09, 02Jul 29, 03[C23G]
6582520 Dross collecting zinc potDec 09, 97Jun 24, 03[B05C]
6474402 Segmented roll for casting metal stripJul 02, 99Nov 05, 02[F28F, B22D]
6096183 Method of reducing defects caused by conductor roll surface anomalies using high volume bottom spraysDec 05, 97Aug 01, 00[C25D]
5961285 Method and apparatus for removing bottom dross from molten zinc during galvannealing or galvanizingJun 19, 96Oct 05, 99[F04B, F04D]
5868875 Non-ridging ferritic chromium alloyed steel and method of makingDec 19, 97Feb 09, 99[C21D, C22C]
5779819 Grain oriented electrical steel having high volume resistivityFeb 20, 97Jul 14, 98[H01F]
5743968 Hydrogen peroxide pickling of stainless steelMar 20, 97Apr 28, 98[B08B, C23G]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5533372 Controlled material flow hydroformingExpiredAug 24, 94Jul 09, 96[B21D]
5460651 Induction heated meniscus coating vesselExpiredApr 28, 94Oct 24, 95[B05C]
5456953 Method for coating bake hardenable steel with a water based chromium bearing organic resinExpiredFeb 26, 93Oct 10, 95[B05D]
5452790 Mounting system for a roller tableExpiredJun 10, 94Sep 26, 95[B65G]
5339329 Induction heated meniscus coating vesselExpiredJan 25, 93Aug 16, 94[H05B]
5157969 Apparatus and method for hydroforming sheet metalExpiredNov 29, 89Oct 27, 92[B21D]

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