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Trademarks = 2

Forward Citations = 135

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11 inventors (with patents filed for the assignee):

George R Ferguson (3 out of 4 patents)

Eckart F Schultze (1 out of 4 patents)

Ralph R Barber (1 out of 4 patents)

4. Martin A Opyrchal (1 out of 1 patent)

5. John D Christensen (1 out of 1 patent)

6. James C Johnson (1 out of 1 patent)

7. William W Royer (1 out of 1 patent)

8. John P Rollins (1 out of 1 patent)

9. James C Lucas (1 out of 1 patent)

10. Robert P Harbage (1 out of 1 patent)

11. Albert L Leffler, Jr (1 out of 1 patent)

10 patents: Sort by Forward Citations

1. 4735262 - Rotary steam joint (1988-04-05),

2. 4691452 - Articulable siphon tube assembly for dryer drum (1987-09-08),

3. 4556832 - Control valve apparatus (1985-12-03),

4. 4500069 - Hydraulic directional control valve (1985-02-19),

5. 4477107 - Rotating joint with separated bearings and seals (1984-10-16),

6. 4392390 - Shielding apparatus for linear actuator (1983-07-12),

7. D252567 - Pendent hoist control (1979-08-07),

8. 4014467 - Dishwasher and coupling (1977-03-29),

9. 4000664 - Mechanical actuator (1977-01-04),

10. 3957144 - Continuous roller brake (1976-05-18),

Duff-Norton Company, Inc. is a leading manufacturer of industrial lifting and positioning equipment. They offer a wide range of products including actuators, jacks, and rotary unions for various industries such as aerospace, automotive, and construction. With over 130 years of experience, Duff-Norton is known for their innovative solutions and exceptional quality.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

10 Patents

#90 in Charlotte, NC

#605 in North Carolina

#28,955 in US

#54,268 in the World

Charlotte, NC, United States of America

Duff-norton Company, Inc.