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For the Inventor, By the Inventor

Tualatin, OR, United States of America

Kai U.s.a., Ltd.


USPTO Granted Patents = 67

% Expired Patents = 3.0

Trademarks = 161

Forward Citations = 1,736

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23 inventors (with patents filed for the assignee):

goldMedal Kenneth J Onion (26 out of 74 patents)

silverMedal Grant Woodrow Hawk (9 out of 16 patents)

bronzeMedal Gavin Dan Hawk (9 out of 16 patents)

4.  Craig Green (9 out of 9 patents)

5.  Dennis L Epstein (9 out of 9 patents)

6.  Takeshi Ono (6 out of 10 patents)

7.  Timothy James Galyean (5 out of 5 patents)

8.  James MacNair (3 out of 3 patents)

9.  Craig Donald Kemp Green (3 out of 3 patents)

10.  Douglas B Flagg (3 out of 5 patents)

11.  Tommie Lucas (2 out of 6 patents)

12.  Katsumi Hasegawa (2 out of 2 patents)

13.  Peter G Kershaw (2 out of 2 patents)

14.  Neil Hollis Slater (1 out of 1 patent)

15.  Darrell Lewis (1 out of 1 patent)


Core Competencies:
Folding Knife
Safety Lock
Blade Mechanism
Knife Handle
Multi-Tool
Locking Mechanism
Pocket Knife
Knife Blade
Assisted Opening
Carabiner Knife
Mandolin Slicer
Utility Knife

67 patents:

1. 12552054 - Assisted opening and closing knife with lock (2026-02-17),
2. 10071489 - Locking folding knife (2018-09-11),
3. 9707687 - Folding knife with disengageable assisted-opening mechanism (2017-07-18),
4. 9393682 - Folding tool assembly (2016-07-19),
5. 9120234 - Locking folding knife (2015-09-01),
6. 9079320 - Folding knife with disengageable assisted-opening mechanism (2015-07-14),
7. 9038517 - Mandolin slicer (2015-05-26),
8. 8601907 - Knife blade manufacturing process (2013-12-10),
9. 8291597 - Folding knife with sealed mechanism (2012-10-23),
10. RE42906 - Folding knife with safety lock (2011-11-14),
11. 8028873 - Ratchet type pocket clip (2011-10-04),
12. 7979990 - Safety lock mechanism for folding knives (2011-07-19),
13. 7905022 - Folding knife having a locking mechanism (2011-03-15),
14. D633772 - Knife handle (2011-03-08),
15. 7774939 - Stud-lock knife (2010-08-17),
Company Overview
Kai U.S.A., Ltd., based in Tualatin, Oregon, specializes in the design and manufacture of high-quality folding knives and multi-tools. The company is recognized for its innovative approach to knife technology, focusing on safety locks, blade mechanisms, and ergonomic handle designs. With a commitment to craftsmanship and functionality, Kai U.S.A. serves both outdoor enthusiasts and everyday users, ensuring reliability and performance in their products. Their expertise spans various aspects of knife engineering, contributing to advancements in locking mechanisms and blade utility.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

67 Patents

#3 in Tualatin, OR

#68 in Oregon

#5,453 in US

#11,023 in the World

Tualatin, OR (US)
Tualatin, OR, United States of America

Kai U.s.a., Ltd.

Forward Citations = 1,736

23 inventors:

goldMedal Kenneth J Onion (26 out of 74 patents)

silverMedal Grant Woodrow Hawk (9 out of 16 patents)

bronzeMedal Gavin Dan Hawk (9 out of 16 patents)

4.  Craig Green (9 out of 9 patents)

5.  Dennis L Epstein (9 out of 9 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Kai U.s.a., Ltd.. Retrieved from https://idiyas.com/company/kai-u-s-a

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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