Caledonian Mining Co., Ltd.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
 
 
H01J ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS 1127

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5149957 Semiconductor-to-metal optical switch for power limitation in the infraredAug 21, 91Sep 22, 92[H01J]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5306099 Mine tunnel support systemExpiredMay 05, 92Apr 26, 94[E21D]
5176474 Mine tunnel support systemsExpiredOct 28, 91Jan 05, 93[E21D]
4988232 Joint membersExpiredMay 23, 89Jan 29, 91[B25G]
4893489 Drive system for a bending machineExpiredMar 14, 88Jan 16, 90[B21D]
4890676 Apparatus and method for lining bore holes with pre-formed lining shellsExpiredOct 12, 88Jan 02, 90[E21D, E21B]
4887546 Lining of bore holesExpiredNov 25, 87Dec 19, 89[B05B]
4615199 Strip bendingExpiredNov 12, 85Oct 07, 86[B21D]
4589795 Beam couplingExpiredJan 16, 85May 20, 86[F16B, B25G]
4391115 Method and apparatus for bending metal beamsExpiredDec 03, 80Jul 05, 83[B21D]

Top Inventors for This Owner

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