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For the Inventor, By the Inventor

Portlethen, United Kingdom

Downhole Products Limited


USPTO Granted Patents = 30

% Expired Patents = 16.7



Trademarks = 7

Forward Citations = 359

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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 Darko Arsoski (8 out of 8 patents)

4.  Ian Alistair Kirk (8 out of 16 patents)

5.  Douglas Farley (6 out of 18 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)


Core Competencies:
Float Collar
Centralizer
Casing Shoe
Stop Collar
Downhole Tool
Flow Valve
Rasping Shoe
Cement Control
Expandable Centralizer
Gripping Device
Composite Casing
Toe Valve

30 patents:

1. 12584380 - Combination landing and float collar (2026-03-24),
2. 12392219 - Ball deflector for float collar (2025-08-19),
3. 12312879 - Rasping shoe for non-rotational deployment of casing string (2025-05-27),
4. 12305452 - Centralizer having internal stop collar (2025-05-20),
5. 12286845 - Slimline stop collar with seal to prevent micro-annulus leakage (2025-04-29),
6. 12270262 - Float equipment for use with composite casing or liner string (2025-04-08),
7. 12110747 - Casing shoe with flow operated diverter valve (2024-10-08),
8. 12012812 - Dual flow converted auto-fill float valve (2024-06-18),
9. 11965384 - Variable stiffness centralizer (2024-04-23),
10. 11920432 - Toe valve with vented atmospheric chamber (2024-03-05),
11. 11536095 - Slimline stop collar with solid cam ring (2022-12-27),
12. 11486228 - Resettable toe valve (2022-11-01),
13. 11428073 - Overpressure toe valve with atmospheric chamber (2022-08-30),
14. 11286729 - Slimline stop collar (2022-03-29),
15. 11203902 - Guide shoe with lockable nose (2021-12-21),
Downhole Products Limited is a specialized engineering company based in Portlethen, UK, focusing on the development and manufacturing of innovative downhole tools and equipment for the oil and gas industry. The company excels in providing solutions that enhance drilling efficiency and safety, leveraging advanced technology and engineering expertise. With a commitment to quality and reliability, Downhole Products serves a global market, addressing the complex challenges faced by operators in the energy sector.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

30 Patents

#1 in Portlethen

#593 in United Kingdom

#21,840 in the World

Portlethen, GB
Portlethen, United Kingdom

Downhole Products Limited

Forward Citations = 359

18 inventors:

goldMedal William Barron (9 out of 11 patents)

silverMedal Alexander Craig Mackay (8 out of 26 patents)

bronzeMedal Darko Arsoski (8 out of 8 patents)

4.  Ian Alistair Kirk (8 out of 16 patents)

5.  Douglas Farley (6 out of 18 patents)

Please report any incorrect information to [email protected]
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