KEYSTONE ENGINEERING & MANUFACTURING CORP.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21C MINING OR QUARRYING220

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
8528990 Cutter with diamond bit tipDec 13, 11Sep 10, 13[E21C]
8020941 Cutter bit insert removal system and methodDec 11, 08Sep 20, 11[E21C]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
8424974 Wear insert and retainerExpiredDec 13, 11Apr 23, 13[E21C]
2012/0119,562 MINE SAFETY SYSTEMAbandonedNov 10, 11May 17, 12[F16L, E21F, E02F]
2010/0181,820 WEAR INSERT AND RETAINERAbandonedJan 22, 09Jul 22, 10[E21C]
2004/0004,389 Replacable wear surface for bit supportAbandonedJul 07, 03Jan 08, 04[E21C]
5052757 Flighting section and tooth holderExpiredJun 11, 90Oct 01, 91[E21C]

Top Inventors for This Owner

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