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For the Inventor, By the Inventor

Placentia, CA, United States of America

Hartwell Corporation


USPTO Granted Patents = 120

% Expired Patents = 2.5



Trademarks = 6

Forward Citations = 2,562

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45 inventors (with patents filed for the assignee):

goldMedal L Richard Poe (23 out of 24 patents)

silverMedal Timothy Scott Rozema (16 out of 16 patents)

bronzeMedal John P Anderson (16 out of 17 patents)

4.  Frank T Jackson (11 out of 11 patents)

5.  Thomas J Helsley (10 out of 10 patents)

6.  Frank Thomas Jackson (7 out of 7 patents)

7.  Bo Dumitru Artin (7 out of 7 patents)

8.  John D Pratt (6 out of 48 patents)

9.  William R Bourne, Jr (6 out of 8 patents)

10.  Timothy J Clavin (6 out of 7 patents)

11.  Raymond E Harmon (6 out of 11 patents)

12.  Lane Dennis Dalan (5 out of 13 patents)

13.  Bernard W Henrichs (5 out of 5 patents)

14.  William R Bourne (5 out of 6 patents)

15.  Darrell L James (4 out of 6 patents)


Core Competencies:
Aircraft Latch
Rotary Latch
Adjustable Hook
Locking Hinge
Pressure Relief Latch
Self-Closing Latch
Latching System
Key Lock Assembly
Hold Open Rod
Pin Latch
Bifurcated Latch
Dampening Strut

120 patents:

1. D1088806 - Aircraft latch lock key (2025-08-19),
2. 12054965 - Clevis-sensing adjustable hook latch (2024-08-06),
3. 11866189 - Latching system with movable anti-shear mechanism (2024-01-09),
4. 11773622 - Key, lock, and latch assembly (2023-10-03),
5. D973463 - Aircraft latch lock key head (2022-12-27),
6. 11530557 - Dual switch rotary latch (2022-12-20),
7. 11421459 - Four-bar linkage hinge (2022-08-23),
8. 11408210 - Pin latch with adjustable pre-load (2022-08-09),
9. 11358701 - Door assembly with double-acting hinge (2022-06-14),
10. 11193305 - Lock apparatus (2021-12-07),
11. 11053717 - Hold open rod assembly (2021-07-06),
12. 11002046 - High offset hook latch (2021-05-11),
13. 10767404 - Four-bar linkage hinge (2020-09-08),
14. 10670063 - Hold open rod locking mechanism (2020-06-02),
15. 10443279 - Single link hook latch (2019-10-15),
Hartwell Corporation, based in Placentia, California, specializes in the design and manufacture of advanced latching mechanisms. The company focuses on a diverse range of products including aircraft latches, rotary latches, adjustable hooks, and locking hinges. Hartwell's innovative solutions cater to various industries, emphasizing safety and reliability in latching systems. With a commitment to quality and engineering excellence, Hartwell Corporation plays a crucial role in enhancing the functionality and security of mechanical systems.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

Hartwell Corporation
120 Patents

#1 in Placentia, CA

#725 in California

#3,214 in US

#6,637 in the World

Placentia, CA (US)
Placentia, CA, United States of America

Hartwell Corporation

Forward Citations = 2,562

45 inventors:

goldMedal L Richard Poe (23 out of 24 patents)

silverMedal Timothy Scott Rozema (16 out of 16 patents)

bronzeMedal John P Anderson (16 out of 17 patents)

4.  Frank T Jackson (11 out of 11 patents)

5.  Thomas J Helsley (10 out of 10 patents)

Please report any incorrect information to [email protected]
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