Patent FR-1911-417989.14395

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This is the second addition to Patent FR-1910-417989, which brevet was filed 1910-06-25.

Oddly perhaps, Espacenet gives no IPC or CPC classification to this patent.

We could get back to this, but it specifically has to do with the "hélicoïde".


Year filed 1911
Year granted 1911
Office FR
Patent number 14395
Inventors Édouard-Jean Bigourdan
Inventor country FR
Applicant person Édouard-Jean Bigourdan
Applicant firm
Applicant type INDIV
Applicant is inventor? Yes
Original title Biplan concentrique à mouvements contraires
English title Concentric biplane with contrary movements, actually a helicopter, featuring two counter-rotating blades, or sets of blades
Tech fields design, propellers, propulsion, helicopter
Filing date 1911/06/07
Full specification filed date
Application number 14395D
Grant date 1911/09/26
Granted? Yes
Publication date 1911/11/27
Supplementary to patent Patent FR-1910-417989
Related to aircraft? Yes
Serial number
Patent agent de Bongé
Assigned to
National tech categories FR 6.4
Family year 1910
First filing? No
Cites these patents
Citations from after 1930
Application ID 335557519
INPADOC family ID 5198345
Number of text pages 2
Number of diagram pages 0
Number of figures 0
Number of claims 6