Growing community of inventors

San Diego, CA, United States of America

David A Mackichan

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 = 12

David A MackichanThomas Bernard Shappie (2 patents)David A MackichanDavid A Mackichan (2 patents)Thomas Bernard ShappieThomas Bernard Shappie (4 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Macshappie Enterprises, Inc. (2 from 3 patents)


2 patents:

1. 10028456 - Tree and plant watering systems

2. 9456560 - Tree and plant watering systems

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as of
12/21/2025
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