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For the Inventor, By the Inventor

Chicago, IL, United States of America

Chicago Lock Company


USPTO Granted Patents = 34

Trademarks = 4

Forward Citations = 459

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9 inventors (with patents filed for the assignee):

goldMedal Robert L Steinbach (22 out of 22 patents)

silverMedal Frank J Scherbing (4 out of 11 patents)

bronzeMedal Aloysius J Mikos (3 out of 5 patents)

4.  Walter S Christopher (3 out of 3 patents)

5.  Mitch Mlynarczyk (1 out of 1 patent)

6.  John S Broska (1 out of 1 patent)

7.  William J Kerr (1 out of 1 patent)

8.  Robert T Kriskovich (1 out of 1 patent)

9.  Joseph P Tauber (1 out of 1 patent)


Core Competencies:
Lock Assembly
Tumbler Lock
Key Cutting
Locking Mechanism
Key Ejector
Pop Out Handle
Slide Fastener
Lock-Picking Tool
Protective Cover
Alarm Switch
Cylinder Lock
Handle Flange

34 patents:

1. 5916283 - Key ring lock assembly (1999-06-29),
2. 5160180 - Automatic quick open/close locking mechanism (1992-11-03),
3. D330501 - Key head (1992-10-27),
4. 5106251 - Automatic locking device for pop out handle locks (1992-04-21),
5. 4899565 - Square shaped axial split pin tumbler lock (1990-02-13),
6. 4835998 - Removable handle for T-handle lock assembly (1989-06-06),
7. 4821539 - Keeper lock for slide fastener (1989-04-18),
8. 4760721 - Handle flange assembly (1988-08-02),
9. 4735069 - Cylinder lock and key (1988-04-05),
10. 4712400 - Removable cylinder lock (1987-12-15),
11. 4671711 - Key-cutting machine (1987-06-09),
12. 4617813 - Lock-picking tool and method of use thereof (1986-10-21),
13. 4446709 - Cylinder lock mechanism (1984-05-08),
14. 4395893 - Plate tumbler-type cylinder lock mechanism (1983-08-02),
15. 4326396 - Plate tumbler for a cylinder lock mechanism (1982-04-27),
Company Overview
Chicago Lock Company specializes in the design and manufacture of high-quality locking mechanisms and security solutions. With a focus on innovation, the company develops products that cater to various sectors, including residential, commercial, and industrial markets. Their expertise encompasses mechanical locks, electronic locking systems, and access control technologies, ensuring robust security for diverse applications. Based in Chicago, IL, the company is committed to advancing security technology while maintaining a strong emphasis on reliability and customer satisfaction.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

34 Patents

#137 in Chicago, IL

#549 in Illinois

#10,014 in US

#19,631 in the World

Chicago, IL (US)
Chicago, IL, United States of America

Chicago Lock Company

Forward Citations = 459

9 inventors:

goldMedal Robert L Steinbach (22 out of 22 patents)

silverMedal Frank J Scherbing (4 out of 11 patents)

bronzeMedal Aloysius J Mikos (3 out of 5 patents)

4.  Walter S Christopher (3 out of 3 patents)

5.  Mitch Mlynarczyk (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Chicago Lock Company. Retrieved from https://idiyas.com/company/chicago-lock-company

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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