David F. Lewis

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Hartford, Northwich, Cheshire, GB

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Patents Grantslast 30 patents

Information Patent Grant
Aromatic polysulphones
- Patent number 5,693,740
- Issue date Dec 2, 1997
- United Utilites PLC
- Howard Matthew Colquhoun
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Aromatic ketone
- Patent number 4,777,300
- Issue date Oct 11, 1988
- Imperial Chemical Industries PLC
- Howard M. Colquhoun
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Purification of 4-fluoro-4'-hydroxybenzophenone
- Patent number 4,612,399
- Issue date Sep 16, 1986
- Imperial Chemical Industries PLC
- Howard M. Colquhoun
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Production of aromatic polyketones
- Patent number T103703
- Issue date Dec 6, 1983
- Howard M. Colquhoun
- 528 - Synthetic resins or natural rubbers