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Polysar Limited

USPTO Granted Patents = 139

CIPO Patents = 2

Trademarks = 3

Forward Citations = 1,462

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110 inventors (with patents filed for the assignee):

Douglas C Edwards (14 out of 14 patents)

Kyosaku Sato (12 out of 13 patents)

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: Sort by Forward Citations

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),

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 based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

139 Patents

#1 in Sarnia

#90 in Canada

#5,817 in the World

Polysar Limited

Forward Citations = 1,462

110 inventors:

Douglas C Edwards (14 out of 14 patents)

Kyosaku Sato (12 out of 13 patents)

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)

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