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For the Inventor, By the Inventor

West Chester, OH, United States of America

Keystone Retaining Wall Systems, Inc.


USPTO Granted Patents = 218

% Expired Patents = 15.1



Trademarks = 42

Forward Citations = 5,068

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22 inventors (with patents filed for the assignee):

goldMedal Robert A MacDonald (132 out of 133 patents)

silverMedal Thomas S Riccobene (65 out of 75 patents)

bronzeMedal 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
Wall Block Systems
Retaining Wall Block
Multi-Faceted Faces
Block Splitter Assembly
Patio Blocks
Veneer Connectors
Irregular Tessellated Units
Building Unit
Connection Surface
Weight Bearing Pads

218 patents:

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),
Company Overview
Keystone Retaining Wall Systems, Inc. is a leading innovator in the design and manufacture of retaining wall systems, primarily serving the landscaping and construction industries. Based in West Chester, Ohio, the company specializes in a range of products including segmented wall systems, retaining wall blocks, and patio blocks, which are engineered for durability and aesthetic appeal. Their technology encompasses multi-faceted faces and block splitter assemblies, providing versatile solutions for various landscaping needs.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

218 Patents

#1 in West Chester, OH

#93 in Ohio

#1,921 in US

#3,917 in the World

West Chester, OH (US)
West Chester, OH, United States of America

Keystone Retaining Wall Systems, Inc.

Forward Citations = 5,068

22 inventors:

goldMedal Robert A MacDonald (132 out of 133 patents)

silverMedal Thomas S Riccobene (65 out of 75 patents)

bronzeMedal 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)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Keystone Retaining Wall Systems, Inc.. Retrieved from https://idiyas.com/company/keystone-retaining-wall-systems

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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