Growing community of inventors

Kingston, Canada

David N Ferrence

Average Co-Inventor Count = 1.00

ph-index = 2

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 = 34

David N FerrenceDavid N Ferrence (3 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Utdc Inc. (3 from 21 patents)


3 patents:

1. 5131713 - Vehicle for a freight transportation system

2. 5078566 - Freight discharge apparatus

3. 5015141 - Freight transportation system

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as of
12/18/2025
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