Growing community of inventors

Brentwood, MO, United States of America

Douglas C Ruhmann

Average Co-Inventor Count = 3.43

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 = 130

Douglas C RuhmannFrederick E Vorwerk (2 patents)Douglas C RuhmannJames D Mundloch (2 patents)Douglas C RuhmannRalph A Britton (1 patent)Douglas C RuhmannDouglas C Ruhmann (2 patents)Frederick E VorwerkFrederick E Vorwerk (6 patents)James D MundlochJames D Mundloch (4 patents)Ralph A BrittonRalph A Britton (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Acf Industries, Incorporated (2 from 400 patents)


2 patents:

1. 4608931 - Filament wound railway hopper car

2. 4497258 - Transverse bulkhead connection to filament wound vehicle body sides

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as of
12/16/2025
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