Growing community of inventors

Wylie, TX, United States of America

Mark E Kerr

Average Co-Inventor Count = 2.00

ph-index = 3

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 = 91

Mark E KerrJohn A Hird (5 patents)Mark E KerrMark E Kerr (5 patents)John A HirdJohn A Hird (20 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Intellicall, Inc. (4 from 23 patents)

2. First City, Texas-Dallas (1 from 3 patents)


5 patents:

1. 5513738 - Coin handling system

2. 5441138 - Coin handling system with an improved coin chute

3. 5388680 - Coin handling system with an improved coin chute

4. 5255770 - Coin handling system

5. 5090548 - Coin handling system

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as of
1/12/2026
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