David A Hejl

USPTO Granted Patents = 8 (Patent Applications = 1)

EPO Patents = 1 (Patent Applications = 1)

Average Co-Inventor Count = 2.8

ph-index = 5

Forward Citations = 137(Granted Patents)

Location History:

Dallas, TX (US) (2003 - 2007)
Houston, TX (US) (2007 - 2023)

Company Filing History:

5 out of 11,766

Halliburton Energy Services, Inc.

patents

1 out of 5,728

Baker Hughes Corporation

patents

1 out of 830

Baker Hughes Oilfield Operations LLC

patents

4. 1 out of 1,388

Baker Hughes, a Ge Compnay, LLC

patents

Years Active: 2003-2023

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8 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 11629592 - Extendable downhole tool and related systems, apparatus, and methods (2023-04-18),

2. 10316657 - Extendable probe and formation testing tool and method (2019-06-11),

3. 9790789 - Apparatus and method for obtaining formation fluid samples (2017-10-17),

4. 7252153 - Bi-directional fluid loss device and method (2007-08-07),

5. 7243724 - Apparatus and method for treating an interval of a wellbore (2007-07-17),

6. 6814139 - Gravel packing apparatus having an integrated joint connection and method for use of same (2004-11-09),

7. 6789624 - Apparatus and method for gravel packing an interval of a wellbore (2004-09-14),

8. 6516882 - Apparatus and method for gravel packing an interval of a wellbore (2003-02-11),

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1 patent pending:

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1 patent (EPO):

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1 patent pending (EPO):

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