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For the Inventor, By the Inventor

Sarnia, Canada

Polysar Limited

Calculating rank
USPTO Granted Patents = 139


Trademarks = 3

Forward Citations = 1,496

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110 inventors (with patents filed for the assignee):

goldMedal Douglas C Edwards (14 out of 14 patents)

silverMedal Kyosaku Sato (12 out of 13 patents)

bronzeMedal Ernest Jack Buckler (8 out of 8 patents)

4.  Michael Hugh Richmond (7 out of 7 patents)

5.  Eric G Kent (7 out of 7 patents)

6.  Ronald J Thompson (5 out of 7 patents)

7.  Herbert F Schwarz (5 out of 5 patents)

8.  James Lunt (5 out of 5 patents)

9.  Erhardt Fischer (5 out of 5 patents)

10.  Akhtar Osman (4 out of 17 patents)

11.  Evalds Lasis (4 out of 4 patents)

12.  Yung-Kang Wei (4 out of 4 patents)

13.  Ivan S Lee (4 out of 4 patents)

14.  Dilipkumar Padliya (3 out of 5 patents)

15.  Stephen C Davis (3 out of 4 patents)


Core Competencies:
Metallocene Catalyst
Toughened Thermoplastics
Butyl Rubber
Polymer Recovery
Nitrile Rubber
Thermoset Resins
Vulcanizable Compositions
Adhesive Polymers
EPDM Elastomers
Polymer Production
Fibre Reinforcement
Chemical Stripping

139 patents:

1. 5372980 - Bimetallic metallocene alumoxane catalyst system and its use in the (1994-12-13),
2. 5336719 - Transparent toughened plastics (1994-08-09),
3. 5252664 - Transparent toughened thermoplastics (1993-10-12),
4. 5244965 - Polymer solution treatment process (1993-09-14),
5. 5194538 - Preparation of butyl rubber with bimodal molecular weight distribution (1993-03-16),
6. 5194528 - Dimer reduction (1993-03-16),
7. 5079296 - Transparent toughened thermoplastics (1992-01-07),
8. 5051299 - Fibre reinforced belt (1991-09-24),
9. 5045603 - Chlorinated EPDM with superior stability (1991-09-03),
10. 5043392 - Toughened thermoplastics (1991-08-27),
11. 5026794 - Adducts of an hydroxy-free acrylate resin and an epoxy resin (1991-06-25),
12. 5026744 - Synthetic clay (1991-06-25),
13. 4990456 - Analysis of asphalt (1991-02-05),
14. 4985540 - Process for removing rhodium-containing catalyst residue from (1991-01-15),
15. 4983528 - Measurement of unsaturation level in butyl and EPDM rubbers (1991-01-08),
Company Overview
Polysar Limited, headquartered in Sarnia, Canada, specializes in polymer chemistry, focusing on the development and manufacturing of advanced polymer materials. The company is known for its expertise in metallocene catalysts, toughened thermoplastics, and various rubber compounds, including butyl and nitrile rubber. Polysar also engages in innovative research related to thermoset resins, vulcanizable compositions, and adhesive polymers, contributing to diverse applications across multiple industries, including automotive and construction.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

139 Patents

#1 in Sarnia

#91 in Canada

#5,832 in the World

Sarnia, CA
Sarnia, Canada

Polysar Limited

Forward Citations = 1,496

110 inventors:

goldMedal Douglas C Edwards (14 out of 14 patents)

silverMedal Kyosaku Sato (12 out of 13 patents)

bronzeMedal Ernest Jack Buckler (8 out of 8 patents)

4.  Michael Hugh Richmond (7 out of 7 patents)

5.  Eric G Kent (7 out of 7 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Polysar Limited. Retrieved from https://idiyas.com/company/polysar

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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