Growing community of inventors

Orange Village, OH, United States of America

David E Cowan

Average Co-Inventor Count = 2.67

ph-index = 4

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 = 70

David E CowanDavid Allen Cowan (3 patents)David E CowanGregory H Brown (3 patents)David E CowanCharles M Mettler (1 patent)David E CowanDavid E Cowan (4 patents)David Allen CowanDavid Allen Cowan (22 patents)Gregory H BrownGregory H Brown (21 patents)Charles M MettlerCharles M Mettler (21 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Plastic Safety Systems, Inc. (4 from 29 patents)


4 patents:

1. 6769207 - Portable sign assembly

2. 6182600 - Traffic channeling device

3. D406543 - Traffic channelizer

4. 5421668 - Tread ballast or weight for temporary traffic control devices and posts

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as of
1/13/2026
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