Patent GB-1918-119974

• From google patents abstract: "Planes, arrangement and construction of. Tail fins for aeroplanes and other aircraft are constructed with two vertical spars extending into the fuselage, either the front or rear spar being laterally flexible and the other spar rigid so that the effectiveness of the fin shall be respectively increased or diminished with increase of speed. Fig. 1 shows a fin 2 having a flexible rear spar 5 and rigid front spar 4 extending into the fuselage. A rudder 3 is pivoted to the rear edge of the fin."
• Tech class: CPC B64C13/00: Control systems or transmitting systems for actuating flying-control surfaces, lift-increasing flaps, air brakes, or spoilers
• Inventor location:

Sources

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

Year filed	1918
Year granted	1918
Office	GB
Patent number	119974
Inventors	Harris Booth
Inventor country	GB
Applicant person	Harris Booth
Applicant firm	Blackburn Aeroplane and Motor Co.
Applicant type	COMPANY
Applicant is inventor?	0
Original title	Improvements in or relating to the Tail Fins of Aeroplanes or other Aircraft
English title	Improvements in or relating to the Tail Fins of Aeroplanes or other Aircraft
Tech fields
Filing date	1918-01-24
Full specification filed date	1918-07-22
Application number	137318
Grant date	1918-10-24
Granted?	1
Publication date
Supplementary to patent
Related to aircraft?	1
Serial number
Patent agent	Brewer & Son
Assigned to
National tech categories
IPCs	IPC B64C13/00
CPCs	CPC B64C13/00, CPC B64C2700/6256
Family year	1918
First filing?	1
Cites these patents
Citations from after 1930	1
Application ID	20989838
INPADOC family ID	23455412
Number of text pages	2
Number of diagram pages	1
Number of figures	2
Number of claims	2