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For the Inventor, By the Inventor

Portlethen, United Kingdom

Downhole Products Limited


USPTO Granted Patents = 29



Trademarks = 10

Forward Citations = 355

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18 inventors (with patents filed for the assignee):

goldMedal William Barron (9 out of 11 patents)

silverMedal Alexander Craig Mackay (8 out of 26 patents)

bronzeMedal Ian Alistair Kirk (8 out of 16 patents)

4.  Darko Arsoski (7 out of 7 patents)

5.  Douglas Farley (5 out of 17 patents)

6.  Ian Alastair Kirk (5 out of 5 patents)

7.  Alistair Bertram Clark (5 out of 7 patents)

8.  Andrew Keith Kirk (4 out of 7 patents)

9.  Keith David Bradford (2 out of 2 patents)

10.  Alistair Bertrum Clark (2 out of 2 patents)

11.  Jonathan Peter Buckland (1 out of 7 patents)

12.  Nathan James Kirk (1 out of 1 patent)

13.  Allstair Bertram Clark (1 out of 1 patent)

14.  Arron Rimmer (1 out of 1 patent)

15.  Barry Newton (1 out of 1 patent)


29 patents:

1. 12392219 - Ball deflector for float collar (2025-08-19),
2. 12312879 - Rasping shoe for non-rotational deployment of casing string (2025-05-27),
3. 12305452 - Centralizer having internal stop collar (2025-05-20),
4. 12286845 - Slimline stop collar with seal to prevent micro-annulus leakage (2025-04-29),
5. 12270262 - Float equipment for use with composite casing or liner string (2025-04-08),
6. 12110747 - Casing shoe with flow operated diverter valve (2024-10-08),
7. 12012812 - Dual flow converted auto-fill float valve (2024-06-18),
8. 11965384 - Variable stiffness centralizer (2024-04-23),
9. 11920432 - Toe valve with vented atmospheric chamber (2024-03-05),
10. 11536095 - Slimline stop collar with solid cam ring (2022-12-27),
11. 11486228 - Resettable toe valve (2022-11-01),
12. 11428073 - Overpressure toe valve with atmospheric chamber (2022-08-30),
13. 11286729 - Slimline stop collar (2022-03-29),
14. 11203902 - Guide shoe with lockable nose (2021-12-21),
15. D892868 - Tubing shoe (2020-08-11),
Downhole Products Limited is a leading international designer, manufacturer, and supplier of downhole products for the oil and gas industry. With over 25 years of industry experience, the company offers a wide range of innovative and high-quality downhole drilling tools, well completion equipment, and accessories. Their products are designed to enhance drilling efficiency, extend operational life, and maximize productivity in challenging wellbore conditions. With a global presence and a commitment to customer satisfaction, Downhole Products Limited is trusted by major oil and gas operators worldwide.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Dec 30 2025

29 Patents

#1 in Portlethen

#614 in United Kingdom

#21,869 in the World

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Portlethen, United Kingdom

Downhole Products Limited

Forward Citations = 355

18 inventors:

goldMedal William Barron (9 out of 11 patents)

silverMedal Alexander Craig Mackay (8 out of 26 patents)

bronzeMedal Ian Alistair Kirk (8 out of 16 patents)

4.  Darko Arsoski (7 out of 7 patents)

5.  Douglas Farley (5 out of 17 patents)

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