Patent DK-1916-21998

This patent makes no priority date reference. However, its diagrams match half of those found on Patent FR-1916-492896, which makes reference to a Norwegian patent filed 1915-12-15. Patent DK-1916-22694 contains the analogous reference and the appropriate other half of the diagrams. These are therefore closely related and tied to the same root.

Sources

• Original patent document and bibliography entry on espacenet
• Inventor location: Kristiania, Norge (Norway)

Patent family descending from Patent DK-1916-21998

• Patent DK-1916-21998 (English title: Device for Stabilizing Aircraft, Supplementary to patent: Patent NO-1915-12-15 Carl Alfred Johansson, National tech categories: DE 77)
• Patent DK-1916-22694 (English title: Device for Stabilizing Aircraft, Supplementary to patent: Patent NO-1915-12-15 Carl Alfred Johansson • Patent DK-1916-21998, National tech categories: DE 77)

Year filed	1916
Year granted	1917
Office	DK
Patent number	21998
Inventors	Carl Alfred Johansson
Inventor country	NO
Applicant person	Carl Alfred Johansson
Applicant firm
Applicant type	INDIV
Applicant is inventor?	Yes
Original title	Anordning til Stabilisering af Flyvemaskiner
English title	Device for Stabilizing Aircraft
Tech fields	HTA, stability, automatic stability
Filing date	1916-01-14
Full specification filed date
Application number
Grant date	1917-03-02
Granted?	Yes
Publication date	1917-03-12
Supplementary to patent	Patent NO-1915-12-15 Carl Alfred Johansson
Related to aircraft?	Yes
Serial number
Patent agent
Assigned to
National tech categories	DE 77
IPCs
CPCs
Family year	1915
First filing?	No
Cites these patents
Citations from after 1930
Application ID
INPADOC family ID
Number of text pages	2
Number of diagram pages	1
Number of figures	2
Number of claims	2