Patent FR-1911-429541

Appears to be an elogated helicopter with several vertical propellers. Neither the patent spec nor the CPC tech classifier is simply calling it a helicopter. I don't know why, but let's bet on that techtype until there's evidence otherwise.

• Tech class CPC B64C23/005: Influencing air flow over aircraft surfaces, not otherwise provided for
• Inventor location:

Patent family descending from Patent US-1911-1006282

• Patent US-1911-1006282 (English title: Airship, Filing date: 1911-01-25, National tech categories: USPC 244/129.1)
• Patent GB-1911-3627 (English title: Improvements in and relating to Flying Machines, Supplementary to patent: Patent US-1911-1006282, Filing date: 1911-02-13)
• Patent FR-1911-429541 (English title: Air vessel, Supplementary to patent: Patent US-1911-1006282, Filing date: 1911-04-14, National tech categories: FR 6.4)

Sources

• Original patent document and bibliography entry on espacenet
• Patent FR429541A on google patents

Year filed	1911
Year granted	1911
Office	FR
Patent number	429541
Inventors	Carl Emil Ritter
Inventor country	US
Inventor location	California
Applicant person	Carl Emil Ritter
Applicant firm
Applicant type	INDIV
Applicant is inventor?	1
Original title	Navire aérien
English title	Air vessel
Tech fields	helicopter
Filing date	1911-04-14
Full specification filed date
Application number	429541D
Grant date	1911-07-21
Granted?	1
Publication date	1911-09-25
Supplementary to patent	Patent US-1911-1006282
Related to aircraft?	1
Serial number
Patent agent	G. Petiau
Assigned to
National tech categories	FR 6.4
IPCs	IPC B64C23/00
CPCs	CPC B64C23/005, CPC B64C2700/6274
Family year	1911
First filing?	0
Cites these patents
Citations from after 1930
Application ID	19248238
INPADOC family ID	5320545
Number of text pages	3
Number of diagram pages	1
Number of figures	4
Number of claims	1