Growing community of inventors

Annapolis, MD, United States of America

Francis C Keffer

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 = 22

Francis C KefferCharles M Kelly (2 patents)Francis C KefferFrancis C Keffer (2 patents)Charles M KellyCharles M Kelly (3 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Other (1 from 832,812 patents)


2 patents:

1. D254627 - Hand-held shower head

2. 4193553 - Hand-held shower head

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as of
12/20/2025
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