For the Inventor, By the Inventor

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Harrison, AR, United States of America

Duncan Industries Parking Control Systems Corp.

USPTO Granted Patents = 11

CIPO Patents = 1

Forward Citations = 943

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11 inventors (with patents filed for the assignee):

Ralph H Carmen (9 out of 16 patents)

Joseph H Sutton (4 out of 4 patents)

John W Van Horn (3 out of 8 patents)

4. James M Rodgers (3 out of 3 patents)

5. J Michael Rodgers (1 out of 2 patents)

6. Robert R Diekhoff (1 out of 1 patent)

7. Hazem Hassan (1 out of 1 patent)

8. Gorm Tuxen (1 out of 1 patent)

9. Daniel P Kasuba (1 out of 1 patent)

10. Clyde Johnson (1 out of 1 patent)

11. Michael D Boehner (1 out of 2 patents)

11 patents: Sort by Forward Citations

1. 5841369 - Parking meter with peripheral functions (1998-11-24),

2. 5806651 - Coin discrimination system (1998-09-15),

3. 5805083 - Electronic parking meter operating system (1998-09-08),

4. 5526662 - Cashless key and receptacle system (1996-06-18),

5. 5382780 - Portable time metering device (1995-01-17),

6. 5273151 - Resonant coil coin detection apparatus (1993-12-28),

7. 5244070 - Dual coil coin sensing apparatus (1993-09-14),

8. 5184707 - Coin operated timing mechanism (1993-02-09),

9. 5155614 - Low-power demodulating receiver with amplifier stages sharing the same (1992-10-13),

10. 5109972 - Coin operated timing mechanism (1992-05-05),

11. 4880406 - Meter handle mechanism (1989-11-14),

Duncan Industries Parking Control Systems Corp. is a leading provider of innovative parking solutions for commercial and residential properties. With over 50 years of experience in the industry, Duncan Industries offers a wide range of products and services, including parking meters, gate operators, access control systems, and software solutions. Their team of expert technicians and engineers are dedicated to providing reliable and efficient parking solutions for their customers.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

11 Patents

#1 in Harrison, AR

#60 in Arkansas

#26,743 in US

#50,238 in the World

Harrison, AR, United States of America

Duncan Industries Parking Control Systems Corp.

Forward Citations = 943

11 inventors:

Ralph H Carmen (9 out of 16 patents)

Joseph H Sutton (4 out of 4 patents)

John W Van Horn (3 out of 8 patents)

4. James M Rodgers (3 out of 3 patents)

5. J Michael Rodgers (1 out of 2 patents)

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