Hendrik A. Witkamp

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Pijnacker, NL

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Patents Grantslast 30 patents

Information Patent Grant
Cephem derivatives
- Patent number 5,359,058
- Issue date Oct 25, 1994
- Gist-Brocades, NV
- Jan Verweij
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Cephalosporin derivatives
- Patent number 5,164,494
- Issue date Nov 17, 1992
- Gist-Brocades N.V.
- Hendrik A. Witkamp
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of 3-exomethylene cepham derivatives
- Patent number 5,109,132
- Issue date Apr 28, 1992
- Gist-Brocades N.V.
- Jan Verweij
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Cepham derivatives
- Patent number 4,994,454
- Issue date Feb 19, 1991
- Gist-Brocades N.V.
- Jan Verweij
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of 3-exomethylene cepham derivatives
- Patent number 4,985,554
- Issue date Jan 15, 1991
- Gist-Brocades N.V.
- Jan Verweij
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of cephem compounds
- Patent number 4,921,954
- Issue date May 1, 1990
- Gist-Brocades N.V.
- Hendrik A. Witkamp
- C07 - ORGANIC CHEMISTRY