Patent FR-1917-495383

Propellers are used both in horizontal propulsion and in what the French call sustentation are key here. The terms propulseur and sustentateur are both specifically and repeatedly used here.

Based upon the diagram, this aircraft conceived in 1917 bears little resemblance to an airplane, unlike that of 1915. Both employ propellers in the furtherance of vertical, as well as horizontal, movement. This invention is fundamentally and airship the sustentation of which is boosted via propellers

• Inventor location: Seine, France, though Patent FR-1915-481332, its original, that is, has him described as "resident in Serbia", and the Espacenet bibliographic data page gives him the "RU" designation.

Sources

• Original patent document and bibliography entry on espacenet
• Patent FR495383A on google patents

Year filed	1917
Year granted	1919
Office	FR
Patent number	495383
Inventors	Lyoubomir Boïovitch
Inventor country	FR
Inventor location	Seine
Applicant person	Lyoubomir Boïovitch
Applicant firm
Applicant type	INDIV
Applicant is inventor?	Yes
Original title	Perfectionnements aux appareils d'aviation
English title	Improvements in aviation apparatus (that is, propellers of ascension and propulsion, here applied in the hybrid manner to an airship)
Tech fields	propeller, propulsion, ascension, elevation, lift, hybrid, sustentation, LTA, HTA
Filing date	August 2, 1917
Full specification filed date
Application number	495383D
Grant date	June 28, 1919
Granted?	Yes
Publication date	October 7, 1919
Supplementary to patent
Related to aircraft?	Yes
Serial number
Patent agent	Charles F. Baudry
Assigned to
National tech categories	FR 6.4
IPCs	IPC B64C27/04
CPCs	CPC B64C27/04
Family year	1917
First filing?	No
Cites these patents
Citations from after 1930
Application ID	19312536
INPADOC family ID	5375786
Number of text pages	3
Number of diagram pages	1
Number of figures	6
Number of claims	4