Growing community of inventors

Norwich, United Kingdom

Dave Coffin

Average Co-Inventor Count = 1.20

ph-index = 6

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 188

Dave CoffinWolfgang Rainer Althaus (2 patents)Dave CoffinDave Coffin (6 patents)Wolfgang Rainer AlthausWolfgang Rainer Althaus (35 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Wilkinson Sword Gesellschaft MIT Beschrankter/haftung (4 from 30 patents)

2. Warner-Lambert Company (2 from 2,538 patents)


6 patents:

1. 5373638 - Razor head, especially razor blade unit of a wet razor

2. 5365665 - Razor head with flow passages

3. 5265759 - Arrangement for the accommodation and sales display of razor blade units

4. 5070613 - Razor head, especially razor blade unit of a wet safety razor

5. 5029391 - Pivot-head razor

6. 4985995 - Razor head, especially a razor blade unit

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as of
1/13/2026
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