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% Expired Patents = 14.3

Forward Citations = 71

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6 inventors (with patents filed for the assignee):

Zhi-Zhong Liang (4 out of 4 patents)

Raymond T Woodhams (2 out of 14 patents)

Zhi-zhong Liang (2 out of 3 patents)

4. James W Smith (1 out of 23 patents)

5. Yan-Ping Zhang (1 out of 1 patent)

6. Zhi Zhong Liang (1 out of 1 patent)

7 patents: Sort by Forward Citations

1. 6737443 - Lignin based colloidal compositions (2004-05-18),

2. 6579921 - Modified bituminous composition for roof membranes (2003-06-17),

3. 6429241 - Elastomer-modified bituminous compositions (2002-08-06),

4. 6174939 - Stabilized bituminous composition based on polymer in-situ blend (2001-01-16),

5. 6100317 - Stabilized bitumen compositions (2000-08-08),

6. 5959007 - Bituminous compositions prepared with process treated vulcanized rubbers (1999-09-28),

7. 5719215 - Treatment of rubber to form bituminous compositions (1998-02-17),

Polyphalt Inc. specializes in manufacturing and distributing high-quality polymer-modified asphalt products for the construction industry. With over 30 years of experience, our innovative solutions provide superior performance, durability, and cost-effectiveness. We are committed to delivering environmentally friendly and sustainable asphalt solutions for various applications.

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USPTO Data Jan 1 1976 - Sep 22 2026

7 Patents

#208 in Toronto

#2,092 in Canada

Toronto, Canada

Polyphalt Inc.