Patent FR-1909-395148

Long theoretical preamble about the instability of contemporary aircraft designs, citing Soreau, 1897, Le problème général de la navigation aérienne p. 72.

Then, describes construction of a more complex airplane system using a distribution of Hargrave cells intended to confer more balance. Sizes, shapes, and specifications are given in relatively great detail.

• Inventor location: rue de la Carrière-Saint-Eugène, 25, Alger, Alger

Note, title translation is rough but tries to get at the spirit of the idea.

Patents which are supplementary to this one

• Patent GB-1909-22814 (English title: Aeroplanes, Filing date: 1909-10-06)
• Patent IT-1909-105401 (English title: Airplane with counterbalancing cells, Filing date: 1909-10-06)
• Patent FR-1909-395148.11260 (English title: Airplane with counterbalancing cells, Filing date: 1909-07-03)

Sources

• Original patent document and bibliography entry on espacenet

Year filed	1908
Year granted	1909
Office	FR
Patent number	395148
Inventors	Pierre-Mathieu Pietri
Inventor country	DZ
Applicant person	Pierre-Mathieu Piétri‎
Applicant firm
Applicant type	INDIV
Applicant is inventor?	No
Original title	Aéroplane cellulaire à effets compensés
English title	Airplane with counterbalancing cells
Tech fields	airplane, stability, whole, design, frame, Hargrave cells
Filing date	1908/10/07
Full specification filed date
Application number	395148D
Grant date	1909/02/11
Granted?	Yes
Publication date
Supplementary to patent
Related to aircraft?	Yes
Serial number
Patent agent	0
Assigned to
National tech categories	FR 6.4
IPCs
CPCs	CPC B64C2700/6295, CPC B64C39/00
Family year	1908
First filing?	No
Cites these patents
Citations from after 1930
Application ID	19214575
INPADOC family ID	5196135
Number of text pages	6
Number of diagram pages	3
Number of figures	17
Number of claims