Jacques Lejeune
French patent agent Jacques Lejeune also acted in tandem with Charles Dony, and we have a few patents listed as registered via the agency of Dony and Lejeune. This work in partnership seems generally if not entirely to have come later than the work of Lejeune and Dony as solo agents.
When solo he usually goes by "J. Lejeune"; however, the name Jacques Lejeune is used on Patent FR-1910-415046.12993. We can be reasonably sure it's the same person because of his connection with the same inventor (Oswald François Leopold Keun) and with Dony. This is further substantiated upon the cross-referencing of certificates of addition to the initial brevets with which they are connected.
In at least one rare instance we have presumably this Jacques Lejeune acting as one of the "witnesses", for a French inventor filing an American patent.[1] That it is the same Jacques Lejeune is fairly definite in that we have this patent agent acting in conjunction with the same inventor elsewhere.
Patents for which Jacques Lejeune was the patent agent
- Patent FR-1910-415046.12993 (Inventors: Oswald François Leopold Keun, English title: Airplane, Supplementary to patent: Patent FR-1910-415046)
- Patent FR-1910-415046 (Inventors: Oswald François Leopold Keun, English title: Airplane)
- Patent FR-1911-424689 (Inventors: Halvor Olsen Eiane, English title: Improvements to aeroplanes and other aerial machines)
- Patent FR-1911-428412 (Inventors: Armand-Jean-Auguste Deperdussin, English title: Process for manufacturing hulls for aeroplanes, boats and the like)
- Patent FR-1911-438193 (Inventors: René Hanriot • Henri-Hubert Pagny, English title: Device allowing, without drilling or notching the wood, to ensure the connection of the various elements of the lattice beams used in the construction of airplanes)
- Patent FR-1912-450466.18100 (Inventors: Armand-Jean-Auguste Deperdussin, English title: Helicopter, or more properly a gyroscope preventing the nacelle from rotating with the propellers, Supplementary to patent: Patent FR-1912-450466)
- Patent FR-1912-445712 (Inventors: Henri-Hubert Pagny, English title: Forced-intake carburetor, Applicant firm: Société anonyme des appareils d'aviation Hanriot)
- Patent FR-1912-450466 (Inventors: Armand-Jean-Auguste Deperdussin, English title: Helicopter, actually constituted of multiple airplanes)
- Patent FR-1913-466634 (Inventors: Louis-Alfred Ponnier • Henri-Hubert Pagny, English title: Nacelle for aerial navigation devices)
- Patent FR-1914-475080.19676 (Inventors: Armand-Jean-Auguste Deperdussin, English title: Arrangement of of machine guns or similar apparatus onboard airplanes, Supplementary to patent: Patent FR-1915-475080)
- Patent FR-1915-475080 (Inventors: Armand-Jean-Auguste Deperdussin, English title: Apparatus of machine gun or likewise on board airplanes, Applicant firm: Le Syndicat de Faillite)
