Location History:
- Hampton, VA (US) (1985 - 1990)
- Tabb, VA (US) (1991 - 1992)
- Yorktown, VA (US) (1994 - 2005)
- Arlington, MA (US) (2007 - 2010)
- Poquoson, VA (US) (2008 - 2013)
- Williamsburg, VA (US) (2022)
Company Filing History:
7 out of 21 
7 out of 51,873 
6 out of 24 
Years Active: 1985-2022
Title: David F. Johnston: Innovator in Mechanical and Electrostatic Systems
Introduction
David F. Johnston, based in Yorktown, Virginia, is a prolific inventor with an impressive portfolio of 35 patents. His contributions are particularly notable in the fields of mechanical systems and electrostatic filtration, showcasing his innovative approach to solving complex engineering challenges.
Latest Patents
Among his latest inventions, the "Fan Brake Control System" stands out. This system is designed to selectively slow, stop, and lock rotating machinery while minimizing shock loads, thereby enhancing the performance and safety of mechanical braking devices. Key components of this system include a fan brake, a position sensor, a microcontroller, an actuator, an operator interface, and a fan motor interface.
Another significant innovation by Johnston is related to "Control of Grounded Surface Geometry in Electrostatically Enhanced Fabric Filters." This electrostatic filter assembly is engineered to effectively remove particulate matter from gas streams. It incorporates a high voltage discharge electrode to impart electric charges to particles and generates an electrical field at the filter assembly, carefully designed to limit degradation of the filter element during operation.
Career Highlights
David Johnston has had a remarkable career, notably working for companies such as Voice Signal Technologies, Inc. and General Electric Company. His roles in these organizations allowed him to further develop his innovative ideas and contribute to advancements in technology.
Collaborations
Throughout his professional journey, Johnston has collaborated with notable individuals, including Michael McCall Mahler and Terry Lewis Farmer. These partnerships have facilitated the cross-pollination of ideas and insights, which have undoubtedly enriched his work and innovations.
Conclusion
David F. Johnston’s contributions to mechanical and electrostatic systems underscore his status as an influential inventor. With a prolific record of patents and collaborations, his work continues to impact various industries, reflecting his dedication to innovation and engineering excellence.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.