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Chillicothe, IL, United States of America

John T Armstrong, Jr

Average Co-Inventor Count = 2.00

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 = 59

John T Armstrong, Jr ↔ Randall M Mitchell (1 patent)John T Armstrong, Jr ↔ Michael L Render (1 patent)John T Armstrong, JrJohn T Armstrong, Jr (2 patents)Randall M MitchellRandall M Mitchell (14 patents)Michael L RenderMichael L Render (2 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Caterpillar Tractor Co. (2 from 1,981 patents)


2 patents:

1. 4523892 - Hydrostatic vehicle control

2. 4331917 - Speed and direction sensing circuit

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as of
1/7/2026
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