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For the Inventor, By the Inventor

Hudsonville, MI, United States of America

Conrac Corporation


USPTO Granted Patents = 13


Trademarks = 1

Forward Citations = 239

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14 inventors (with patents filed for the assignee):

goldMedal Mark B Siehling (2 out of 2 patents)

silverMedal Stanley R Van Antwerp (2 out of 2 patents)

bronzeMedal Hilario S Costa (2 out of 2 patents)

4.  John M Macmillan (2 out of 2 patents)

5.  Dan N Ciocan (2 out of 2 patents)

6.  Gary Edward Holt (1 out of 4 patents)

7.  Frank D Roberts (1 out of 2 patents)

8.  Frans Brouwer (1 out of 15 patents)

9.  James E Westbrook (1 out of 1 patent)

10.  J Hardy House (1 out of 1 patent)

11.  Joe F Guess (1 out of 3 patents)

12.  Eugene F Lagasse (1 out of 1 patent)

13.  Paul M Thomsen (1 out of 1 patent)

14.  Elmer M Bruce (1 out of 1 patent)

15.  Jürgen Bernhardt (0 patent)


13 patents:

1. 4943904 - D.C. power unit assembly including unitized single-phase D.C. power units (1990-07-24),
2. 4803754 - Electromechanical door holder-closer (1989-02-14),
3. 4705992 - System for stabilizing cathode emissions with an in-line gun cathode ray (1987-11-10),
4. 4700218 - Automated system for adjustment of the white balance in a signal (1987-10-13),
5. 4682000 - Welding transformer and rectifier assembly (1987-07-21),
6. D260498 - Smoke detector housing (1981-09-01),
7. 4238679 - Dual-chamber ionization smoke detector assembly (1980-12-09),
8. 4127840 - Solid state force transducer (1978-11-28),
9. 4110561 - Communication unit for code generation and voice communication (1978-08-29),
10. 4090030 - Antenna mount and connector (1978-05-16),
11. 4087799 - Particulate products of combustion detector employing solid state (1978-05-02),
12. D246899 - Combined microphone gooseneck adapter and switch therefor (1978-01-10),
13. 4045620 - Digital tone detector (1977-08-30),
Company Overview
Conrac Corporation specializes in the design and manufacture of advanced display solutions and integrated systems for various industries, including transportation and public spaces. With a focus on enhancing user experience, the company develops innovative products that cater to the needs of airports, transit systems, and other high-traffic environments. Based in Hudsonville, Michigan, Conrac Corporation leverages its expertise in technology and engineering to deliver reliable and efficient solutions that meet the evolving demands of its clients.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

13 Patents

#2 in Hudsonville, MI

#848 in Michigan

#23,815 in US

#44,988 in the World

Hudsonville, MI (US)
Hudsonville, MI, United States of America

Conrac Corporation

Forward Citations = 239

14 inventors:

goldMedal Mark B Siehling (2 out of 2 patents)

silverMedal Stanley R Van Antwerp (2 out of 2 patents)

bronzeMedal Hilario S Costa (2 out of 2 patents)

4.  John M Macmillan (2 out of 2 patents)

5.  Dan N Ciocan (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Conrac Corporation. Retrieved from https://idiyas.com/company/conrac

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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