Growing community of inventors

Winchester, VA, United States of America

David M Campbell

Average Co-Inventor Count = 3.16

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 = 28

David M CampbellMarcus A Loignon (2 patents)David M CampbellMichael Smith (1 patent)David M CampbellVasiliy Maksimov (1 patent)David M CampbellGeorge Gemberling, Jr (1 patent)David M CampbellGeorge Gemberling, Sr (1 patent)David M CampbellBrian L Steeley (1 patent)David M CampbellYaron Bukchin (1 patent)David M CampbellDavid M Campbell (3 patents)Marcus A LoignonMarcus A Loignon (2 patents)Michael SmithMichael Smith (22 patents)Vasiliy MaksimovVasiliy Maksimov (3 patents)George Gemberling, JrGeorge Gemberling, Jr (2 patents)George Gemberling, SrGeorge Gemberling, Sr (2 patents)Brian L SteeleyBrian L Steeley (1 patent)Yaron BukchinYaron Bukchin (1 patent)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Automated Merchandising Systems, Inc. (2 from 17 patents)

2. Other (1 from 832,680 patents)


3 patents:

1. 9147304 - Reversible multi-position gearmotor and storage tray for vending machines

2. 9147303 - Rotary hopper

3. 8140187 - Multiple drawer and compartment vending

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as of
12/8/2025
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