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Mark Howell
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Westonaria Extension, ZA
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Patents Grants
last 30 patents
Information
Patent Grant
Mine support system
Patent number
5,547,317
Issue date
Aug 20, 1996
HL&H Timber Products (Pty) Limited
Mark Howell
E21 - EARTH DRILLING MINING
Information
Patent Grant
Grout composition
Patent number
5,454,866
Issue date
Oct 3, 1995
H L & H Timber Products (Pty) Ltd.
Gregory M. Gilbert
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Yieldable load support
Patent number
5,318,387
Issue date
Jun 7, 1994
H L & H Timber Products (Proprietary) Limited
Frans R. P. Pienaar
E21 - EARTH DRILLING MINING