Growing community of inventors

Houston, TX, United States of America

David A Hejl

Average Co-Inventor Count = 2.77

ph-index = 5

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 = 137

David A HejlRobert W Crow (3 patents)David A HejlRonald W McGregor (3 patents)David A HejlTravis Thomas Hailey, Jr (2 patents)David A HejlRonald A Gibson (2 patents)David A HejlShiva Paramhans (2 patents)David A HejlPhilip D Nguyen (1 patent)David A HejlWilliam David Henderson (1 patent)David A HejlShawn Olsen (1 patent)David A HejlW Mark Richards (1 patent)David A HejlRussell W Mceacharn (1 patent)David A HejlW David Henderson (1 patent)David A HejlRussell W McEacharn (1 patent)David A HejlDavid A Hejl (8 patents)Robert W CrowRobert W Crow (19 patents)Ronald W McGregorRonald W McGregor (12 patents)Travis Thomas Hailey, JrTravis Thomas Hailey, Jr (31 patents)Ronald A GibsonRonald A Gibson (5 patents)Shiva ParamhansShiva Paramhans (2 patents)Philip D NguyenPhilip D Nguyen (430 patents)William David HendersonWilliam David Henderson (42 patents)Shawn OlsenShawn Olsen (4 patents)W Mark RichardsW Mark Richards (2 patents)Russell W MceacharnRussell W Mceacharn (1 patent)W David HendersonW David Henderson (1 patent)Russell W McEacharnRussell W McEacharn (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Halliburton Energy Services, Inc. (5 from 11,795 patents)

2. Baker Hughes Corporation (1 from 5,728 patents)

3. Baker Hughes, a Ge Compnay, LLC (1 from 1,388 patents)

4. Baker Hughes Oilfield Operations LLC (1 from 838 patents)


8 patents:

1. 11629592 - Extendable downhole tool and related systems, apparatus, and methods

2. 10316657 - Extendable probe and formation testing tool and method

3. 9790789 - Apparatus and method for obtaining formation fluid samples

4. 7252153 - Bi-directional fluid loss device and method

5. 7243724 - Apparatus and method for treating an interval of a wellbore

6. 6814139 - Gravel packing apparatus having an integrated joint connection and method for use of same

7. 6789624 - Apparatus and method for gravel packing an interval of a wellbore

8. 6516882 - Apparatus and method for gravel packing an interval of a wellbore

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as of
12/27/2025
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