Growing community of inventors

Pittsburgh, PA, United States of America

Christopher M Umbel

Average Co-Inventor Count = 5.09

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 = 66

Christopher M UmbelEvan Indianer (2 patents)Christopher M UmbelKaigham Jacob Gabriel (1 patent)Christopher M UmbelJoel Lenhart (1 patent)Christopher M UmbelJohn David Ritter (1 patent)Christopher M UmbelMichael Jed Ginsburg (1 patent)Christopher M UmbelJoseph Howard Gatewood (1 patent)Christopher M UmbelPeter Julius Freymark (1 patent)Christopher M UmbelJohn Robert Previs (1 patent)Christopher M UmbelChristopher M Umbel (2 patents)Evan IndianerEvan Indianer (2 patents)Kaigham Jacob GabrielKaigham Jacob Gabriel (18 patents)Joel LenhartJoel Lenhart (1 patent)John David RitterJohn David Ritter (1 patent)Michael Jed GinsburgMichael Jed Ginsburg (1 patent)Joseph Howard GatewoodJoseph Howard Gatewood (1 patent)Peter Julius FreymarkPeter Julius Freymark (1 patent)John Robert PrevisJohn Robert Previs (1 patent)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Ninesigma, Inc. (1 from 2 patents)

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


2 patents:

1. 7849400 - Electronic charting system

2. 6584468 - Method and apparatus to retrieve information from a network

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1/16/2026
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