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Manchester, MI, United States of America

Double a Products Company

USPTO Granted Patents = 14

Forward Citations = 211

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9 inventors (with patents filed for the assignee):

Ronald L Loup (9 out of 14 patents)

Curtis H Day (4 out of 5 patents)

Charles E Johnson (2 out of 2 patents)

4. Arthur W Gill (2 out of 3 patents)

5. Rainer Teichert (2 out of 2 patents)

6. Allen J Carlson (1 out of 1 patent)

7. Henry A Vander Kaay (1 out of 2 patents)

8. George L Schick (1 out of 18 patents)

9. David F Creffield (1 out of 1 patent)

14 patents: Sort by Forward Citations

1. 4574843 - Solenoid valve override cartridge (1986-03-11),

2. 4474104 - Control system for variable displacement pumps and motors (1984-10-02),

3. D273699 - Solenoid operated valve (1984-05-01),

4. 4418720 - Solenoid operated directional valves having modular construction (1983-12-06),

5. 4412196 - Solenoid for directional valves (1983-10-25),

6. 4406307 - Directional valve with spool transfer loop (1983-09-27),

7. 4375226 - Valve body for solenoid operated directional valve (1983-03-01),

8. 4353394 - Solenoid operated directional valve with detent mechanism (1982-10-12),

9. 4308891 - Terminal blocks and indicator for solenoid valves (1982-01-05),

10. 4293284 - Power limiting control apparatus for pressure-flow compensated variable (1981-10-06),

11. 4194173 - Solenoid construction (1980-03-18),

12. 4170214 - Hydraulic valve module (1979-10-09),

13. 4164342 - Variable differential pressure unloading valve apparatus (1979-08-14),

14. 4114637 - Variable differential pressure unloading valve apparatus (1978-09-19),

Double A Products Company is a leading manufacturer of high-quality office supplies. With a wide range of products including paper, stationery, and office accessories, Double A Products is committed to providing customers with top-notch products and exceptional customer service. Visit our website to learn more about our products and place an order today.

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Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

14 Patents

#1 in Manchester, MI

#768 in Michigan

#21,607 in US

#40,905 in the World

Manchester, MI, United States of America

Double a Products Company

Forward Citations = 211

9 inventors:

Ronald L Loup (9 out of 14 patents)

Curtis H Day (4 out of 5 patents)

Charles E Johnson (2 out of 2 patents)

4. Arthur W Gill (2 out of 3 patents)

5. Rainer Teichert (2 out of 2 patents)

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