For the Inventor, By the Inventor

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Torrance, CA, United States of America

Grefco, Inc.

USPTO Granted Patents = 23

Forward Citations = 598

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19 inventors (with patents filed for the assignee):

David L Ruff (9 out of 11 patents)

Harlan E Tarbell (5 out of 5 patents)

Richard B Nielsen (5 out of 6 patents)

4. Sherman A Stewart (4 out of 4 patents)

5. Estel R Snyder (3 out of 3 patents)

6. Melvin J Mirliss (2 out of 3 patents)

7. Ernest L Neu (2 out of 2 patents)

8. Paul J Raabe (2 out of 2 patents)

9. Charles J Vogelsang (2 out of 2 patents)

10. N Gokul Nath (2 out of 2 patents)

11. Narikottile G Nath (1 out of 3 patents)

12. William R White (1 out of 1 patent)

13. Donald W Mogg (1 out of 2 patents)

14. Otto A Oshida (1 out of 1 patent)

15. John B Gilmour (1 out of 2 patents)

23 patents: Sort by Forward Citations

1. 5002696 - Expanded mineral particles and apparatus and method of production (1991-03-26),

2. 4671973 - Method for the treatment of mineral extender fillers (1987-06-09),

3. 4521182 - Method and apparatus for heating particulate material (1985-06-04),

4. 4313997 - Perlite boards and method for making same (1982-02-02),

5. 4302344 - Loose-fill, thermal insulation (1981-11-24),

6. 4255489 - Perlite filler (1981-03-10),

7. 4212755 - Settle resistant loose-fill perlite insulation comprising particles (1980-07-15),

8. 4187174 - Diatomaceous earth filteraid and method for its manufacture (1980-02-05),

9. 4183980 - Perlite filler coated with polydimethylsiloxane (1980-01-15),

10. 4145284 - Method for making polymeric filter aids and products thereof (1979-03-20),

11. 4142968 - Diatomaceous earth filteraid and method for its manufacture (1979-03-06),

12. 4110501 - Splicing strip (1978-08-29),

13. 4073673 - Process for producing an expansion joint cover (1978-02-14),

14. 4071993 - Construction material in sheet form and method of joining sheets (1978-02-07),

15. 4067155 - Sealing system (1978-01-10),

Grefco, Inc. is a leading provider of industrial products and solutions for a wide range of industries. With a focus on quality and reliability, Grefco is known for delivering innovative products and excellent customer service. The company specializes in manufacturing and distributing chemical products, machinery, and equipment to meet the diverse needs of its customers.

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

Company Badge

USPTO Data Jan 1 1976 - Jan 13 2026

23 Patents

#25 in Torrance, CA

#3,305 in California

#13,965 in US

#26,865 in the World

Torrance, CA, United States of America

Grefco, Inc.

Forward Citations = 598

19 inventors:

David L Ruff (9 out of 11 patents)

Harlan E Tarbell (5 out of 5 patents)

Richard B Nielsen (5 out of 6 patents)

4. Sherman A Stewart (4 out of 4 patents)

5. Estel R Snyder (3 out of 3 patents)

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