Growing community of inventors

Bryan, OH, United States of America

Robert C Elfers

Average Co-Inventor Count = 2.40

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 = 46

Robert C Elfers ↔ Nicholas Kozumplik, Jr (2 patents)Robert C Elfers ↔ Douglas D Purdy (1 patent)Robert C ElfersRobert C Elfers (2 patents)Nicholas Kozumplik, JrNicholas Kozumplik, Jr (11 patents)Douglas D PurdyDouglas D Purdy (2 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Ingersoll-Rand Company (1 from 1,201 patents)

2. The Aro Corporation (1 from 86 patents)


2 patents:

1. 5584666 - Reduced icing air valve

2. D370488 - Diaphragm pump

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idiyas.com
as of
1/10/2026
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