For the Inventor, By the Inventor

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Bloomington, MN, United States of America

Keystone Retaining Wall Systems, Inc.

USPTO Granted Patents = 218

CIPO Patents = 117

EPO Patents = 3

Trademarks = 58

Forward Citations = 4,975

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32 inventors (with patents filed for the assignee):

Robert A MacDonald (132 out of 133 patents)

Thomas S Riccobene (65 out of 75 patents)

Robert John Lundell (33 out of 42 patents)

4. David M LaCroix (24 out of 24 patents)

5. Paul J Forsberg (21 out of 27 patents)

6. William B Dawson (18 out of 19 patents)

7. Robert Race (9 out of 13 patents)

8. Stephen Tyson Homeyer (9 out of 9 patents)

9. Craig D Moritz (5 out of 5 patents)

10. Dominic T Riccobene (4 out of 10 patents)

11. David Wei Lee (3 out of 3 patents)

12. Richard Kenneth Magnuson (2 out of 2 patents)

13. Joseph M Friederichs (2 out of 2 patents)

14. J Michael Stevenson (2 out of 2 patents)

15. Kyle Bakner (1 out of 1 patent)

Core Competencies:

Landscaping Block

Segmented Wall Systems

Retaining Wall Block

Veneer Connectors

Patio Blocks

Twisted Block

Block Splitter Assembly

Multi-Faceted Wall Blocks

Weight Bearing Pads

Building Units

Block Systems

Connection Surfaces

218 patents: Sort by Forward Citations

1. D1101209 - Landscaping block (2025-11-04),

2. 12312760 - Segmented wall systems having tail blocks (2025-05-27),

3. D1041034 - Landscaping block (2024-09-03),

4. D1036706 - Landscaping block (2024-07-23),

5. D1036705 - Landscaping block (2024-07-23),

6. 11958211 - Block, block system and method of making a block (2024-04-16),

7. 11598094 - Retaining wall block and retaining wall block system (2023-03-07),

8. 11498241 - Block, block system and method of making a block (2022-11-15),

9. 11401714 - Retaining wall containing wall blocks with weight bearing pads (2022-08-02),

10. 11346559 - Bridging lintel with support hangers for an insert and block system for a structure (2022-05-31),

11. 11174616 - Wall blocks having one or more multi-faceted faces or side walls, wall block systems and methods of constructing a wall (2021-11-16),

12. 11060305 - Patio blocks and block systems with side surface positioning and retaining structures (2021-07-13),

13. 10927547 - Wall blocks, veneer panels for wall blocks and method of constructing walls (2021-02-23),

14. D905282 - Landscaping block wall (2020-12-15),

15. 10760281 - Veneer connectors, wall blocks, veneer panels for wall blocks, and walls (2020-09-01),

Keystone Retaining Wall Systems, Inc. is a leading provider of retaining wall systems and solutions. With over 30 years of experience, they offer innovative and durable products for residential, commercial, and industrial projects. Their wide range of products includes standard and specialized blocks, geogrid soil reinforcement, and landscaping accessories. Keystone Retaining Wall Systems, Inc. is committed to delivering high-quality solutions that meet the needs of their customers while enhancing the beauty and functionality of their landscapes.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

218 Patents

#2 in Bloomington, MN

#51 in Minnesota

#1,834 in US

#3,790 in the World

Bloomington, MN, United States of America

Keystone Retaining Wall Systems, Inc.

Forward Citations = 4,975

32 inventors:

Robert A MacDonald (132 out of 133 patents)

Thomas S Riccobene (65 out of 75 patents)

Robert John Lundell (33 out of 42 patents)

4. David M LaCroix (24 out of 24 patents)

5. Paul J Forsberg (21 out of 27 patents)

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