For the Inventor, By the Inventor

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Valley Forge, PA, United States of America

Certain-teed Products Corporation

USPTO Granted Patents = 2

Trademarks = 2

Forward Citations = 13

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4 inventors (with patents filed for the assignee):

Edmund Thelen (1 out of 3 patents)

Harold L Heller (1 out of 2 patents)

James Joseph Eberl (1 out of 1 patent)

4. Peter F Heilmayr (1 out of 2 patents)

2 patents: Sort by Forward Citations

1. 4015925 - Extrusion equipment and especially die structure for making plastic (1977-04-05),

2. 3961105 - Method for the manufacture of coated calcium sulfate whisker fibers (1976-06-01),

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USPTO Data Jan 1 1976 - Dec 30 2025

2 Patents

#16 in Valley Forge, PA

#3,361 in Pennsylvania

#92,662 in US

Valley Forge, PA, United States of America

Certain-teed Products Corporation

Forward Citations = 13

4 inventors:

Edmund Thelen (1 out of 3 patents)

Harold L Heller (1 out of 2 patents)

James Joseph Eberl (1 out of 1 patent)

4. Peter F Heilmayr (1 out of 2 patents)

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