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For the Inventor, By the Inventor

Fort, Canada

Sherritt International Corporation


USPTO Granted Patents = 10

% Expired Patents = 10.0



Trademarks = 1

Forward Citations = 8

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19 inventors (with patents filed for the assignee):

goldMedal Preston Carl Holloway (4 out of 5 patents)

silverMedal Gavin Kerry Wyllie Freeman (3 out of 3 patents)

bronzeMedal Jan Tjeerd Smit (2 out of 2 patents)

4.  Michael J Collins (2 out of 10 patents)

5.  Roman Berezowsky (1 out of 4 patents)

6.  Kelvin Richard Buban (1 out of 1 patent)

7.  Fu Qin (1 out of 1 patent)

8.  Mohammad Reza Malek Abbaslou (1 out of 1 patent)

9.  Ali Abbaspour Gharamalek (1 out of 1 patent)

10.  Iftikhar Huq (1 out of 1 patent)

11.  John Henry Marsh (1 out of 1 patent)

12.  John Stiksma (1 out of 6 patents)

13.  Ockert Gerbrandt Pauw (1 out of 1 patent)

14.  James John Budac (1 out of 1 patent)

15.  Aysan Molaei (1 out of 1 patent)


10 patents:

1. 12286686 - Co-processing of copper sulphide concentrate with nickel laterite ore (2025-04-29),
2. 11584975 - Integrated pressure oxidative leach of copper sulphidic feed with copper heap leach (2023-02-21),
3. 11118244 - Low acidity, low solids pressure oxidative leaching of sulphidic feeds (2021-09-14),
4. 10544482 - Recovery of copper from arsenic-containing process feed (2020-01-28),
5. 10449607 - Hydrogen reduction of metal sulphate solutions for decreased silicon in metal powder (2019-10-22),
6. 10358610 - Process for partial upgrading of heavy oil (2019-07-23),
7. 8221710 - Recovering metals from complex metal sulfides (2012-07-17),
8. 6949232 - Producing cobalt (III) hexammine sulfate from nickel cobalt sulfides (2005-09-27),
9. 6267800 - Process for producing cobalt metal powder from nickel-cobalt sulphides (2001-07-31),
10. 6264904 - Process for recovery of cobalt by selective precipitation of cobalt-calcium double salt (2001-07-24),
Company Overview
Sherritt International Corporation is a resource company specializing in the extraction and production of nickel and cobalt, primarily through innovative hydrometallurgical processes. Headquartered in Fort, California, Sherritt is recognized for its commitment to sustainable mining practices and environmental stewardship. The company also engages in oil and gas exploration, leveraging advanced technologies to optimize resource recovery. With operations spanning various regions, Sherritt plays a significant role in the global supply chain for critical minerals.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

Sherritt International Corporation USPTO Patent Assignee Logo
10 Patents

#6 in Fort

#1,525 in Canada

#56,092 in the World

Fort, CA
Fort, Canada

Sherritt International Corporation

Forward Citations = 8

19 inventors:

goldMedal Preston Carl Holloway (4 out of 5 patents)

silverMedal Gavin Kerry Wyllie Freeman (3 out of 3 patents)

bronzeMedal Jan Tjeerd Smit (2 out of 2 patents)

4.  Michael J Collins (2 out of 10 patents)

5.  Roman Berezowsky (1 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sherritt International Corporation. Retrieved from https://idiyas.com/company/sherritt-international

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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