Keystone Investment Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
B22F WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER 943
 
  
 
B23P OTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS 254
 
  
 
C22C ALLOYS 270
 
  
 
C23C COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL 299
 
  
 
B21H MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS 17
 
  
 
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 144

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
8871036 Carburization of metal articlesAug 25, 10Oct 28, 14[C23C]
8444781 Method of strengthening metal parts through ausizingJun 18, 07May 21, 13[C21D]
7854995 High density dual helical gearAug 23, 07Dec 21, 10[B23P, B22F, B32B]
7794551 Carburization of metal articlesDec 14, 05Sep 14, 10[C23C, C22C]
7416696 Powder metal materials and parts and methods of making the sameJan 29, 04Aug 26, 08[B22F]
7364803 High density dual helical gear and method for manufacture thereofJun 21, 05Apr 29, 08[B22F]
6833018 Powder metal materials including glassMay 13, 02Dec 21, 04[B22F]
6793705 Powder metal materials having high temperature wear and corrosion resistanceOct 24, 01Sep 21, 04[B22F]
6630101 Method for producing powder metal gearsAug 16, 01Oct 07, 03[B22F]
6592809 Method for forming powder metal gearsOct 03, 00Jul 15, 03[B22F]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7455711 Process for manufacturing hardened powder metal partsExpiredJun 16, 06Nov 25, 08[B22F]
2003/0047,032 Method of producing powder metal parts from metallurgical powders including sponge ironAbandonedJun 22, 01Mar 13, 03[B22F]
2003/0039,572 Method of producing powder metal parts using induction sinteringAbandonedJun 22, 01Feb 27, 03[B22F]
5256184 Machinable and wear resistant valve seat insert alloyExpiredOct 16, 91Oct 26, 93[B22F]

Top Inventors for This Owner

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