Company Filing History:
Years Active: 1978-2000
Title: Innovations of John G. Purnell
Introduction
John G. Purnell is a notable inventor based in Catonsville, MD (US). He has made significant contributions to the field of marine propulsion technology. With a total of 5 patents to his name, Purnell's work focuses on enhancing the efficiency and performance of outboard motor systems.
Latest Patents
One of his latest patents is titled "Protective shrouding with debris diverting inflow vanes for pump-jet." This invention involves a pump-jet type of outboard propulsion unit that is protectively enclosed within cylindrical shrouding. The design forms an axial flow passage about the exhaust channel of the propulsion unit, allowing for improved fluid medium flow induced by the rotation of impeller blades. The inflow of the fluid medium is modified at the inlet end of the shrouding by a series of angularly spaced vanes, enhancing performance.
Another significant patent is the "Ventilated outboard motor-mounted pumpjet assembly." This invention features a unique surface configuration that fosters atmospheric ventilation, thereby reducing drag typically associated with shrouding for marine impellers. The design includes a blunt trailing edge and a circumferentially stepped impeller shroud, which together create a smooth surface that encourages air circulation. This innovative approach allows for the conversion of conventional outboard open propeller assemblies into shrouded impeller assemblies that deliver equal or superior performance.
Career Highlights
John G. Purnell works for the USA as represented by the Secretary of the Navy. His role involves developing advanced technologies that enhance marine propulsion systems. His innovative designs have contributed to the efficiency and effectiveness of naval operations.
Collaborations
Purnell has collaborated with notable colleagues, including Alan J. Becnel and John G. Stricker. These partnerships have fostered a collaborative environment that encourages innovation and the development of cutting-edge technologies.
Conclusion
John G. Purnell's contributions to marine propulsion technology through his patents demonstrate his commitment to innovation. His work not only enhances the performance of outboard motor systems but also reflects the importance of collaboration in the field of invention.