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Valley Forge, PA, United States of America

Philadelphia Quartz Company

USPTO Granted Patents = 14

Trademarks = 14

Forward Citations = 170

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12 inventors (with patents filed for the assignee):

Richard H Pierce (3 out of 4 patents)

Elliot P Hertzenberg (2 out of 17 patents)

Frank J Lazet (2 out of 6 patents)

4. Helmut Hans Weldes (2 out of 2 patents)

5. M Robert Derolf (1 out of 4 patents)

6. David I Netting (1 out of 4 patents)

7. James H O'Brien (1 out of 1 patent)

8. Mahlon Robert Derolf (1 out of 1 patent)

9. Klaus Robert Lange (1 out of 2 patents)

10. Roy E Wright (1 out of 1 patent)

11. Howard C Ross (1 out of 1 patent)

12. Stephen A Davis (1 out of 1 patent)

14 patents: Sort by Forward Citations

1. 4042313 - Method of imparting color to fires (1977-08-16),

2. 4029514 - Method of precipitating microfine silica using phosphate (1977-06-14),

3. 4018622 - Fluxing agent for removing inorganic deposits from smelters and furnaces (1977-04-19),

4. 4008173 - Defoamer composition (1977-02-15),

5. 3967972 - Soluble silicate disks (1976-07-06),

6. 3966893 - Precipitating .alpha. alumina monohydrate (1976-06-29),

7. 3961022 - Silicate dissolving (1976-06-01),

8. 3960583 - Method of preparing modified hollow, largely spherical particles by (1976-06-01),

9. 3960532 - Preparing alkali metal silicate glass with bubbles (1976-06-01),

10. 3959274 - Preparation of alkali metal and quaternary nitrogen double salts of (1976-05-25),

11. 3954659 - Method of forming stable dispersions of alumina (1976-05-04),

12. 3941723 - Crystallized alkali metal silicate with sequestering agents (1976-03-02),

13. 3935023 - Alumina dispersions (1976-01-27),

14. 3931036 - Compacted alkali metal silicate (1976-01-06),

Philadelphia Quartz Company is a leading manufacturer and supplier of high-quality quartz surfaces. With a focus on innovation and customer satisfaction, we provide a wide range of products for residential and commercial applications. Our team of experts is dedicated to creating beautiful and durable surfaces that enhance any space.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

14 Patents

#7 in Valley Forge, PA

#792 in Pennsylvania

#21,598 in US

#40,882 in the World

Valley Forge, PA, United States of America

Philadelphia Quartz Company

Forward Citations = 170

12 inventors:

Richard H Pierce (3 out of 4 patents)

Elliot P Hertzenberg (2 out of 17 patents)

Frank J Lazet (2 out of 6 patents)

4. Helmut Hans Weldes (2 out of 2 patents)

5. M Robert Derolf (1 out of 4 patents)

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