Derek Ferns

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Gwent, GB

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Patents Grantslast 30 patents

Information Patent Grant
Cover assembly with a locking mechanism
- Patent number 4,955,752
- Issue date Sep 11, 1990
- Van Roll AG
- Derek Ferns
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Frame for a covering for an opening protected by a cover or grating
- Patent number 4,936,703
- Issue date Jun 26, 1990
- Van Roll AG
- Derek Ferns
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Grating with a locking mechanism
- Patent number 4,909,660
- Issue date Mar 20, 1990
- Von Roll, AG.
- Derek Ferns
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Covering for an opening with a cover or grating placed in a frame
- Patent number 4,861,186
- Issue date Aug 29, 1989
- Von Roll, AG.
- Derek Ferns
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING