Growing community of inventors

Monroeville, PA, United States of America

John David Ritter

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 David RitterChristopher M Umbel (1 patent)John David RitterEvan Indianer (1 patent)John David RitterJoseph Howard Gatewood (1 patent)John David RitterJohn Robert Previs (1 patent)John David RitterPeter Julius Freymark (1 patent)John David RitterMichael Jed Ginsburg (1 patent)John David RitterJohn David Ritter (1 patent)Christopher M UmbelChristopher M Umbel (2 patents)Evan IndianerEvan Indianer (2 patents)Joseph Howard GatewoodJoseph Howard Gatewood (1 patent)John Robert PrevisJohn Robert Previs (1 patent)Peter Julius FreymarkPeter Julius Freymark (1 patent)Michael Jed GinsburgMichael Jed Ginsburg (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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1/14/2026
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