Patent HU-1916-74837

Sources

• “Publication/disclosure” will be treated as “date granted”, for now. The “Megjelent (year). évi (month) hó (day)-én (or án)”, that is “Released (month) (day), (year)”, given on the original, is nearly always later, and we do not know which legally constitutes the patent’s being “granted”. Fortunately, filing date data is clean and simple and consistent between the data page and the original.
• the Szellemi Tulajdon Nemzeti Hivatala database in anglophone setting, choosing the Patent option, among the Advanced search on the left of the page, and using patent classification “V/h” as the keyword
• Original .pdf drawn from Szellemi Tulajdon Nemzeti Hivatala database
• Virtual or direct analogue access to Szabadalmi Kőzlőny will facilitate the gathering of other data.
• Inventor location: Gotha
• Inventor occupation: Pilot, or “Flying Master” (Röpülőmester)

This "Schleiffer Mihály" must be Michel Schleiffer whom we have filing in Germany. The new Hungarian data has his nation as (XX), so we are likely dealing with a "Gotha" location which has changed national hands. We could re-examine Espacenet on this individual. He likely filed in AT and very possibly elsewhere.

Year filed	1916
Year granted	1919
Office	HU
Patent number	74837
Inventors	Michel Schleiffer
Inventor country	DE
Applicant person	Michel Schleiffer
Applicant firm
Applicant type	INDIV
Applicant is inventor?	Yes
Original title	Több csavarral hajtott légi jármű
English title	Aircraft driven by multiple screws
Tech fields	propellers, subsystem
Filing date	1916/03/15
Full specification filed date
Application number	74837
Grant date	1919/07/15
Granted?	Yes
Publication date	1919/08/18
Supplementary to patent
Related to aircraft?	Yes
Serial number
Patent agent
Assigned to
National tech categories	HU V/h
IPCs
CPCs
Family year	1916
First filing?	No
Cites these patents
Citations from after 1930
Application ID
INPADOC family ID
Number of text pages
Number of diagram pages
Number of figures
Number of claims