Forward Citations = 83

Loading Chart...

8 inventors (with patents filed for the assignee):

Vernon R Fencl (4 out of 13 patents)

Johann T Hess (2 out of 2 patents)

Aujit Tan (2 out of 2 patents)

4. Demetrios J Rigas (1 out of 1 patent)

5. Frederick C Kucklick (1 out of 1 patent)

6. Alberts Roze (1 out of 1 patent)

7. Kurt Debrunner (1 out of 1 patent)

8. Hans R Luedi (1 out of 1 patent)

7 patents: Sort by Forward Citations

1. 4187406 - Machine for welding seams in automotive wheel rim blanks (1980-02-05),

2. 4050135 - Flat base truck rim forming system (1977-09-27),

3. 4018634 - Method of producing high strength steel pipe (1977-04-19),

4. 3991620 - Apparatus for determining imbalance of tires and the like (1976-11-16),

5. 3981172 - Method and apparatus for expanding spirally welded pipe (1976-09-21),

6. 3952630 - Truck rim edge milling apparatus (1976-04-27),

7. 3934324 - Method and apparatus for forming automotive wheel rim blanks (1976-01-27),

Company Overview

Grotnes Machine Works, Inc. is a leading manufacturer of custom metal forming machinery and equipment. With over 80 years of experience in the industry, Grotnes specializes in designing and producing high-quality machines for various industries including automotive, aerospace, and energy. Their innovative solutions and expertise in metal forming have made them a trusted partner for companies worldwide.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

7 Patents

#455 in Chicago, IL

#1,883 in Illinois

#39,907 in US

Chicago, IL, United States of America

Grotnes Machine Works, Inc.

Forward Citations = 83

8 inventors:

Vernon R Fencl (4 out of 13 patents)

Johann T Hess (2 out of 2 patents)

Aujit Tan (2 out of 2 patents)

4. Demetrios J Rigas (1 out of 1 patent)

5. Frederick C Kucklick (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Grotnes Machine Works, Inc.. Retrieved from https://idiyas.com/company/grotnes-machine-works

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]