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Roger Robarts Briggs
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Kenilworth, Warwickshire CU8 20D, GB
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Patents Grants
last 30 patents
Information
Patent Grant
Rock drill percussion mechanism
Patent number
5,794,717
Issue date
Aug 18, 1998
Roger Robarts Briggs
B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
Information
Patent Grant
Control system for percussion drill
Patent number
5,771,981
Issue date
Jun 30, 1998
Roger Robarts Briggs
E21 - EARTH DRILLING MINING
Information
Patent Grant
Rock drill
Patent number
5,771,982
Issue date
Jun 30, 1998
Roger Robarts Briggs
B28 - WORKING CEMENT, CLAY, OR STONE
Information
Patent Grant
Drilling arrangement and drilling feed mechanism
Patent number
5,678,642
Issue date
Oct 21, 1997
Roger Robarts Briggs
E21 - EARTH DRILLING MINING