HITACHI KYOWA KOGYO CO., LTD.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM1156
 
  
 
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
 
  
 
F16K VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING172

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5633094 Valve having facing layers of co-free Ni-base AlloyOct 26, 95May 27, 97[F16K, B32B]
5494539 Metal member quality improving method by spot weldingAug 29, 94Feb 27, 96[C21D]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5267279 Method and structure for repairing an elongated metal hollow memberExpiredJan 09, 91Nov 30, 93[G21C]
5227124 Method and structure for preventive maintaining an elongated metal hollow memberExpiredAug 02, 90Jul 13, 93[G21C]

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