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Claremont, NH, United States of America

David C Langevin

Average Co-Inventor Count = 3.00

ph-index = 1

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 = 2

David C Langevin ↔ Edward A Bailey (1 patent)David C Langevin ↔ James F Ordway (1 patent)David C LangevinDavid C Langevin (1 patent)Edward A BaileyEdward A Bailey (14 patents)James F OrdwayJames F Ordway (5 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Joy Manufacturing Company (1 from 171 patents)


1 patent:

1. 3933208 - Centralizer control

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as of
12/19/2025
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