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For the Inventor, By the Inventor

La Conner, WA, United States of America

Donald L Stephens

This inventor holds 16 USPTO granted patents. Top assignee: Paccar Inc.. Active years: 1978-1997.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Donald L Stephens. Retrieved from https://idiyas.com/inventor/donald-l-stephens

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 16

% Patents Active = 100.0

Average Co-Inventor Count = 1.2

ph-index = 10

Forward Citations = 262(Granted Patents)


Location History:

  • Los Gatos, CA (US) (1978)
  • Bellevue, WA (US) (1983)
  • King County, WA (US) (1984 - 1985)
  • County of Skagit, WA (US) (1987)
  • Skagit County, WA (US) (1989)
  • Skagit, WA (US) (1994)
  • Unincoporated Area, WA (US) (1994)
  • La Conner, WA (US) (1989 - 1997)

Company Filing History:

goldMedal16 out of 1,220 
 
Paccar Inc.
 patents

Years Active: 1978-1997

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16 patents (USPTO):Explore Patents
1. 5701969 - Frame beaming reduction assembly (1997-12-30),
2. 5570866 - Seat suspension (1996-11-05),
3. 5427404 - Stiff beam suspension system (1995-06-27),
4. 5374077 - Pneumatically damped vehicle suspension system (1994-12-20),
5. 5366238 - Lightweight suspension system for a wheeled vehicle, spring arm and (1994-11-22),
6. 5365646 - Method of manufacturing an elongated spring member (1994-11-22),
7. 5094425 - Engine mounting arrangement (1992-03-10),
8. 5046752 - Axle suspension system (1991-09-10),
9. 4856812 - Axle suspension system (1989-08-15),
10. 4850448 - Sway bar for an engine mounting (1989-07-25),
11. 4845630 - Method and apparatus for calculating corrected vehicle fuel economy (1989-07-04),
12. 4697551 - Quick-response control system for low-flow engine coolant systems (1987-10-06),
13. 4530524 - Apparatus for clamping a hose onto a coolant tube (1985-07-23),
14. 4438825 - Cab pitch restraint (1984-03-27),
15. 4375898 - Air deflector assembly (1983-03-08),

Title: The Innovative Journey of Donald L. Stephens

Introduction

Donald L. Stephens, a prolific inventor based in LaConner, WA, has made significant contributions to the automotive industry with a remarkable portfolio of 16 patents. His inventive spirit addresses key challenges in vehicle design, enhancing comfort and performance for drivers and passengers alike.

Latest Patents

Among his latest innovations is the "Frame Beaming Reduction Assembly." This advanced assembly is designed to eliminate or reduce the amplitude of frame beaming oscillations in motor vehicles, which are often caused by vibratory forces. By strategically utilizing a spring and shock absorbers, this invention effectively cancels out unwanted oscillations, ensuring a smoother ride.

Another noteworthy invention is the "Seat Suspension," which includes a shock-absorbing system to support vehicle seats. This system employs a hydraulic bag coupled with a reservoir, enabling a dampened motion that enhances comfort. The design cleverly allows gas to be compressed within the reservoir to act as a spring, providing an innovative solution without the need for complex mechanisms.

Career Highlights

Donald L. Stephens has dedicated his career to research and development at Paccar Inc., where he has worked alongside talented colleagues including James W. Saunders and Roger P. Penzotti. His work has not only advanced the technology within his company but has also positioned him as a notable figure in the field of automotive innovations.

Collaborations

Collaborating with respected professionals like James W. Saunders and Roger P. Penzotti has further enriched his inventiveness and broadened the impact of his projects. Such teamwork exemplifies the spirit of innovation that thrives at Paccar Inc., allowing for the exchange of ideas and expertise that drive the industry forward.

Conclusion

In summary, Donald L. Stephens stands out as an influential inventor whose contributions have significantly enhanced vehicle technology. His commitment to innovation through his patents addresses critical issues in automotive design, ultimately improving the driving experience for many. With a track record of impactful inventions and a collaborative mindset, Donald continues to pave the way for future advancements in the field.

Profile summary based on public USPTO records.
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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