Growing community of inventors

San Francisco, CA, United States of America

David Matthew Johnson

Average Co-Inventor Count = 4.44

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 = 4

David Matthew JohnsonEric J Shrader (2 patents)David Matthew JohnsonJohn Steven Paschkewitz (2 patents)David Matthew JohnsonNorine E Chang (2 patents)David Matthew JohnsonScott J Limb (1 patent)David Matthew JohnsonDavid Matthew Johnson (2 patents)Eric J ShraderEric J Shrader (76 patents)John Steven PaschkewitzJohn Steven Paschkewitz (41 patents)Norine E ChangNorine E Chang (14 patents)Scott J LimbScott J Limb (31 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Palo Alto Research Center Inc. (2 from 2,078 patents)


2 patents:

1. 9044943 - Inkjet printhead incorporating oleophobic membrane

2. 9016841 - Methods and devices for venting air from ink jet printer subassemblies using oleophobic membranes

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as of
1/17/2026
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