CHEUNG WOH TECHNOLOGIES LTD.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
B21K MAKING FORGED OR PRESSED PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS, WHEELS 320
 
  
 
B21D WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING 254
 
  
 
B21J FORGING; HAMMERING; PRESSING; RIVETING; FORGE FURNACES 218
 
  
 
B23K SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM 291
 
  
 
B23P OTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS 254
 
  
 
G11B INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER 2136
 
  
 
B21C MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL120
 
  
 
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 1100
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 1446
 
  
 
H02K DYNAMO-ELECTRIC MACHINES 1106

Top Patents (by citation)

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Recent Publications

Publication # Title Filing Date Pub Date Intl Class
2016/0296,995 METHOD AND APPARATUS FOR FORGING A HARD DISK DRIVE BASE PLATE WITH AN EXTENDED HEIGHTJul 16, 15Oct 13, 16[B21K, B21J, G11B]
2016/0167,181 METHOD AND APPARATUS FOR FORMING A HARD DISK DRIVE BASE PLATE WITH AN EXTENDED HEIGHTFeb 24, 16Jun 16, 16[B23P, B23K]

Recent Patents

Patent # Title Filing Date Issue Date Intl Class
9536572 Apparatus with sealed cavity formed by at least one impermeable weldMay 16, 14Jan 03, 17[H02K, G11B]
9522446 Method and apparatus for forming a hard disk drive base plate with an extended heightNov 26, 14Dec 20, 16[B23P, B21K, B23K, B21J, G06F, B21C]
9481932 Method and apparatus for progressively forging a hard disk drive base plateApr 26, 12Nov 01, 16[C23C, B21K, G11B, B21C]
7849578 Progressive and transfer die stampingMay 27, 09Dec 14, 10[B23P, B21D]
7546669 Progressive and transfer die stampingJun 08, 04Jun 16, 09[B21D]

Expired/Abandoned/Withdrawn Patents

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