Growing community of inventors

San Diego, CA, United States of America

John Ferraro

Average Co-Inventor Count = 7.00

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 = 69

John FerraroEric Joseph Johnson (3 patents)John FerraroEric Stephen Mattis (3 patents)John FerraroFrank Drogo (3 patents)John FerraroPaul E Martinson (3 patents)John FerraroW Wistar Rhoads (2 patents)John FerraroSteve Castle (2 patents)John FerraroSteven T Castle (1 patent)John FerraroWilliam Wistar Rhoads (1 patent)John FerraroJohn Ferraro (3 patents)Eric Joseph JohnsonEric Joseph Johnson (29 patents)Eric Stephen MattisEric Stephen Mattis (10 patents)Frank DrogoFrank Drogo (10 patents)Paul E MartinsonPaul E Martinson (5 patents)W Wistar RhoadsW Wistar Rhoads (19 patents)Steve CastleSteve Castle (2 patents)Steven T CastleSteven T Castle (22 patents)William Wistar RhoadsWilliam Wistar Rhoads (5 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Hewlett-Packard Development Company, L.p. (2 from 27,442 patents)

2. Hewlett-Packard Company (1 from 9,639 patents)


3 patents:

1. RE40294 - Servicing system for an inkjet printhead

2. 6913338 - Servicing system for an inkjet printhead

3. 5905514 - Servicing system for an inkjet printhead

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as of
1/15/2026
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