Growing community of inventors

Bethel Park, PA, United States of America

John Robert Previs

Average Co-Inventor Count = 7.00

ph-index = 1

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 = 11

John Robert PrevisChristopher M Umbel (1 patent)John Robert PrevisEvan Indianer (1 patent)John Robert PrevisPeter Julius Freymark (1 patent)John Robert PrevisMichael Jed Ginsburg (1 patent)John Robert PrevisJohn David Ritter (1 patent)John Robert PrevisJoseph Howard Gatewood (1 patent)John Robert PrevisJohn Robert Previs (1 patent)Christopher M UmbelChristopher M Umbel (2 patents)Evan IndianerEvan Indianer (2 patents)Peter Julius FreymarkPeter Julius Freymark (1 patent)Michael Jed GinsburgMichael Jed Ginsburg (1 patent)John David RitterJohn David Ritter (1 patent)Joseph Howard GatewoodJoseph Howard Gatewood (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Speech Products, Inc. (1 from 1 patent)


1 patent:

1. 7849400 - Electronic charting system

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1/12/2026
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