Patent FR-1910-419037

• "L’attaque de l’air ou du fluide par la surface concave en forme de coquille creuse des palés de l’hélice."
• "La progression des largeurs de l’hélice depuis l’arbre jusqu’à la périphérie, l’épaisseur étant constante."

That is,

• The attack of air or fluid by the concave shell-shaped surface of the propeller pallets.
• The widths of the propeller are increasing from the shaft to the periphery, the thickness being constant.

Here again we have "pallets" as a fairly standardized term for the structure holding the propeller mechanism. The above aerodynamic specifications vary somewhat from others of Pierre Levasseur. Levasseur does well with the articulation of these specifications. The more ordinary French for "pallets" is "palette", even with the work of Levasseur himself.

Sources

• Original patent document and bibliography entry on espacenet
• on google patents
• Inventor location: département Seine, France

Patent family descending from Patent FR-1910-419037

• Patent FR-1910-419037 (English title: Propeller system, National tech categories: FR 6.2)

Year filed	1910
Year granted	1910
Office	FR
Patent number	419037
Inventors	Pierre Levasseur
Inventor country	FR
Applicant person	Pierre Levasseur
Applicant firm
Applicant type	INDIV
Applicant is inventor?	Yes
Original title	Système d'hélice
English title	Propeller system
Tech fields	Propellers, Construction, Frame, Design, Aerodynamics, Incidence
Filing date	1910/08/06
Full specification filed date
Application number	419037D
Grant date	1910/10/15
Granted?	Yes
Publication date	1910/12/24
Supplementary to patent
Related to aircraft?	Yes
Serial number
Patent agent	Armengaud jeune
Assigned to
National tech categories	FR 6.2
IPCs	IPC B63H1/12
CPCs	CPC B63H1/26, CPC B64C11/16
Family year	1910
First filing?	No
Cites these patents
Citations from after 1930
Application ID
INPADOC family ID
Number of text pages	1
Number of diagram pages	1
Number of figures	4
Number of claims	2