Patent DE-1912-325223

This does not refer explicitly to a prior patent but supposedly Hamilton did patent an aeroplane in GB on 4-28-1911, exactly one year before this filing. We haven't found that patent yet but Patent FR-1912-442866 makes priority date to it. Some of the diagrams in this one are identical to the ones in the French one, but it doesn't have all the diagrams in the French one.

Sources

• Original patent document and Bibliographic info at DPMA
• Original patent document and bibliography entry at espacenet
• Inventor location: London

In keeping with our observations on patent dates we may infer "Patentirt im Deutschen Reiche vom" 1912-04-28 shown on this original document is exactly one day after the filing date.

Year filed	1912
Year granted	1920
Office	DE
Patent number	325223
Inventors	Belton Tattnall Hamilton
Inventor country	GB
Applicant person	Belton Tattnall Hamilton
Applicant firm
Applicant type	INDIV
Applicant is inventor?	Yes
Original title	Flugzeug, dessen Stabilisierungsmittel sich selbsttaetig verstellen koennen, nach Schliessen einer Kupplung aber auch von Hand verstellbar sind
English title	Airplane with automatic stability and control of stability with a hand clutch
Tech fields	stability, airplane, automatic stability
Filing date	1912/04/27
Full specification filed date
Application number	325223D
Grant date	1920/09/10
Granted?	Yes
Publication date	1920/09/10
Supplementary to patent	Patent GB-1911-04-28 Belton Tattnall Hamilton
Related to aircraft?	Yes
Serial number
Patent agent
Assigned to
National tech categories	DE 77h.5
IPCs	IPC B64C13/00
CPCs	CPC B64C13/00, CPC B64C2700/6256
Family year	1911
First filing?	No
Cites these patents
Citations from after 1930
Application ID	10649595
INPADOC family ID	10062053
Number of text pages	2
Number of diagram pages	1
Number of figures	3
Number of claims	1