This inventor holds 3 USPTO granted patents. Top assignees: Freightliner Corporation, Williams Control Industries Inc.. Active years: 1998-2001.
Company Filing History:
Years Active: 1998-2001
Title: Innovations by David J Johnston
Introduction
David J Johnston is an accomplished inventor based in Portland, OR (US). He holds a total of 3 patents that showcase his innovative contributions to vehicle technology. His work primarily focuses on enhancing the functionality and safety of retractable stairway assemblies for vehicles.
Latest Patents
One of his latest patents is the "Retractable stairway assembly for a vehicle." This invention features a stairway assembly that can pivot between deployed and stowed positions. The design includes a sliding support from which the stairway is suspended, allowing for efficient use of space. Additionally, a link couples the coupler to the stairway, and a snubber is integrated to limit vibration when the stairway is stowed. An actuator, which may consist of an electric motor, is positioned above the stairway platform to facilitate the extension and retraction of the stairway.
Another significant patent is the "Method of controlling a retractable stairway assembly." This method involves monitoring various vehicle status conditions, such as whether the vehicle is stopped or if the parking brake is set. If any monitored conditions are not in a predetermined state, the deployment of the stairway is blocked to ensure safety. The system can also activate interior and exterior vehicle alarms based on the vehicle's status and the stairway's operational mode.
Career Highlights
David has worked with notable companies in the industry, including Freightliner Corporation and Williams Control Industries Inc. His experience in these organizations has contributed to his expertise in vehicle technology and innovation.
Collaborations
Throughout his career, David has collaborated with talented individuals such as Michael K Smith and Nasser Zamani. These partnerships have likely enriched his work and led to further advancements in his inventions.
Conclusion
David J Johnston's innovative patents and contributions to vehicle technology demonstrate his commitment to enhancing safety and functionality in the automotive industry. His work continues to influence the design and operation of retractable stairway assemblies, showcasing the importance of innovation in modern vehicles.