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For the Inventor, By the Inventor

Laguna Hills, CA, United States of America

Steward Plastics, Inc.

Calculating rank
USPTO Granted Patents = 12


Forward Citations = 612

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8 inventors (with patents filed for the assignee):

goldMedal Lennart L Carlson (7 out of 8 patents)

silverMedal Eric D Carlson (4 out of 56 patents)

bronzeMedal Douglas I Hoiberg (3 out of 3 patents)

4.  Tamsen Hughes (2 out of 2 patents)

5.  Robert Manson (2 out of 2 patents)

6.  Daniel Chronister (2 out of 2 patents)

7.  Craig Brittain (2 out of 2 patents)

8.  William L Steward (1 out of 2 patents)


12 patents:

1. 12076909 - Helically wound tubing with exposed conductors (2024-09-03),
2. 9982810 - Helically wound plastic tubing with variable profile thickness and methods of making the same (2018-05-29),
3. 9625066 - Helically wound plastic tubing with variable profile thickness and methods of making the same (2017-04-18),
4. 9322501 - Flexible tubing with embedded helical conductors and method of making (2016-04-26),
5. 6190480 - Method of making a double-walled flexible tubing product with helical support bead and heating conductor (2001-02-20),
6. 5848223 - Double-walled flexible tubing product with helical support bead and (1998-12-08),
7. 5637168 - Apparatus and method for making flexible tubing with helically wound (1997-06-10),
8. 5454061 - Apparatus and method for making flexible tubing with helically wound (1995-09-26),
9. 4375381 - Two piece extruded hose (1983-03-01),
10. 4337800 - Two piece extruded hose (1982-07-06),
11. 3966525 - Method of making helically wound plastic tubing (1976-06-29),
12. 3963856 - Flexible, corrugated, plastic tubing having conductive helical bead (1976-06-15),
Company Overview
Steward Plastics, Inc. is a specialized manufacturer based in Laguna Hills, California, focusing on advanced plastic solutions for various industries. The company excels in developing high-performance plastic products, emphasizing innovation in material science and engineering. Steward Plastics is committed to sustainability and quality, providing tailored solutions that meet the evolving needs of its clients. With a strong emphasis on research and development, the company aims to enhance product performance while minimizing environmental impact.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

12 Patents

#11 in Laguna Hills, CA

#6,066 in California

#25,578 in US

#48,209 in the World

Laguna Hills, CA (US)
Laguna Hills, CA, United States of America

Steward Plastics, Inc.

Forward Citations = 612

8 inventors:

goldMedal Lennart L Carlson (7 out of 8 patents)

silverMedal Eric D Carlson (4 out of 56 patents)

bronzeMedal Douglas I Hoiberg (3 out of 3 patents)

4.  Tamsen Hughes (2 out of 2 patents)

5.  Robert Manson (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Steward Plastics, Inc.. Retrieved from https://idiyas.com/company/steward-plastics

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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