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Trademarks = 4

Forward Citations = 431

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12 inventors (with patents filed for the assignee):

Gary L Hatch (3 out of 10 patents)

Michael D Steinhardt (2 out of 14 patents)

Robert R Gundrum (2 out of 3 patents)

4. Bruce A Stump (2 out of 2 patents)

5. Louis Sokol (2 out of 2 patents)

6. Michael J Kurth (1 out of 18 patents)

7. Vue X Yang (1 out of 5 patents)

8. Robert G Schumacher, Ii (1 out of 3 patents)

9. Mark A Wessel (1 out of 2 patents)

10. Anthony C Kortenhorn (1 out of 1 patent)

11. Robert S Frank (1 out of 1 patent)

12. John P Vanderhoef (1 out of 3 patents)

9 patents: Sort by Forward Citations

1. 6436282 - Flow control module for RO water treatment system (2002-08-20),

2. 6117332 - Method for using a center core cartridge feeder insert (2000-09-12),

3. 5976432 - Method and apparatus for the continuous extrusion of block elements (1999-11-02),

4. 5928512 - Demountable filter for a bottle or the like (1999-07-27),

5. 5897770 - Center core cartridge feeder insert (1999-04-27),

6. 5891334 - Filter cartridge retaining assembly (1999-04-06),

7. D405156 - Countertop filter (1999-02-02),

8. 4321660 - Universal trouble light (1982-03-23),

9. 4258414 - Universal trouble light (1981-03-24),

Plymouth Products, Inc. is a leading manufacturer of high-quality consumer goods. With a focus on innovation and sustainability, we strive to provide our customers with top-notch products that enhance their daily lives. From kitchen essentials to home cleaning solutions, we offer a wide range of products that combine functionality, durability, and style. Visit our website to explore our latest offerings and find the perfect solutions for your home.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

9 Patents

#13 in Sheboygan, WI

#704 in Wisconsin

#31,603 in US

Sheboygan, WI, United States of America

Plymouth Products, Inc.