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For the Inventor, By the Inventor

Edmonton, Canada

Master Flo Valve Inc.


USPTO Granted Patents = 15



Trademarks = 5

Forward Citations = 208

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13 inventors (with patents filed for the assignee):

goldMedal Larry J Bohaychuk (11 out of 11 patents)

silverMedal Harry Richard Cove (4 out of 6 patents)

bronzeMedal Anwar Abdul Sleiman (2 out of 2 patents)

4.  Loren Kowalchuk (2 out of 2 patents)

5.  Chad M Dannish (1 out of 2 patents)

6.  Yan Gregory Klyashitsky (1 out of 1 patent)

7.  Graham Ivan Kawulka (1 out of 2 patents)

8.  Patrick Rabby (1 out of 3 patents)

9.  Daniel Harlen Williams (1 out of 1 patent)

10.  Cody Ryan Reynolds (1 out of 1 patent)

11.  Douglas A Finlayson (1 out of 1 patent)

12.  Mark K McNeill (1 out of 1 patent)

13.  Richard Cove (1 out of 1 patent)

14.  Loren G Kowalchuk (0 patent)

15.  Chad Dannish (0 patent)


15 patents:

1. 11073225 - Rotary stepping actuator for valve (2021-07-27),
2. 10012327 - Cage valve with instrumentation (2018-07-03),
3. 10012325 - Cage valve with flow trim for reduced port erosion (2018-07-03),
4. 9458941 - Rotary stepping actuator for valve (2016-10-04),
5. 8490652 - Cage valve with flow trim for reduced fracturing (2013-07-23),
6. 8371333 - Cage valve with erosion control (2013-02-12),
7. 7699075 - Reverse flow flow trim for choke valve (2010-04-20),
8. 7426938 - Choke valve flow trim for fracture prevention (2008-09-23),
9. 7237472 - Linear hydraulic stepping actuator with fast close capabilities (2007-07-03),
10. 6997212 - Choke valve with temperature transmitter (2006-02-14),
11. 6782949 - Choke valve with pressure transmitters (2004-08-31),
12. 6648070 - Insert assembly for a wellhead choke valve (2003-11-18),
13. 6536473 - Choke valve (2003-03-25),
14. 6105614 - Choke valve for throttling fluid flow (2000-08-22),
15. 5431188 - Flow trim for choke (1995-07-11),
Company Overview
Master Flo Valve Inc. is a leading manufacturer specializing in the design and production of high-performance valve solutions for the oil and gas industry. Based in Edmonton, Canada, the company focuses on innovative technologies that enhance the efficiency and reliability of flow control systems. With a commitment to quality and engineering excellence, Master Flo develops products that cater to various applications, ensuring safety and operational effectiveness in demanding environments.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

Master Flo Valve Inc. USPTO Patent Assignee Logo
15 Patents

#19 in Edmonton

#983 in Canada

#39,921 in the World

Edmonton, CA
Edmonton, Canada

Master Flo Valve Inc.

Forward Citations = 208

13 inventors:

goldMedal Larry J Bohaychuk (11 out of 11 patents)

silverMedal Harry Richard Cove (4 out of 6 patents)

bronzeMedal Anwar Abdul Sleiman (2 out of 2 patents)

4.  Loren Kowalchuk (2 out of 2 patents)

5.  Chad M Dannish (1 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Master Flo Valve Inc.. Retrieved from https://idiyas.com/company/master-flo-valve

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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