Growing community of inventors

Rijswijk, Netherlands

Johan F Van Velzen

Average Co-Inventor Count = 2.00

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 = 0

Johan F Van Velzen ↔ David L Roberts (1 patent)Johan F Van VelzenJohan F Van Velzen (1 patent)David L RobertsDavid L Roberts (3 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Shell Oil Comapny (1 from 7,646 patents)


1 patent:

1. 4643257 - Method of recovering hydrocarbons from an underground formation

Please report any incorrect information to support@idiyas.com
idiyas.com
as of
12/16/2025
Loading…