David Howard Birtwistle

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Patents Grantslast 30 patents

Information Patent Grant
Shampoo compositions and method
- Patent number 6,355,234
- Issue date Mar 12, 2002
- Helene Curtis, Inc.
- David Howard Birtwistle
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Shampoo compositions and method
- Patent number 5,977,038
- Issue date Nov 2, 1999
- Helene Curtis, Inc.
- David Howard Birtwistle
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Hair treatment compositions
- Patent number 5,776,444
- Issue date Jul 7, 1998
- Chesebrough-Pond's USA Co., Division of Conopco, Inc.
- David Howard Birtwistle
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE