Patent HU-1917-77894

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"Date and number of convention priority 1917-01-19" ; this may be a reference to either a German or an Austrian parent patent. Siemens & Halske, as such, yield extensive Spanish results on Espacenet, oddly. The priority patent mentioned above may have been filed under another Siemens corporate designation. This Siemens & Halske A.-G., based in Berlin-Siemensstadt and Vienna is to be somewhat disambiguated from Siemens és Halske Részvénytársaság, based in Budapest, found in Patent HU-1900-21140.

The “A.-G.” in this “Siemens & Halske A.-G.” is of the “Aktiengesellshaft” variety, as shown on the original document of this patent. See company types.


  • “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 seemingly 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: Berlin-Siemensstadt and Vienna

Year filed 1917
Year granted 1920
Office HU
Patent number 77894
Inventor country DE
Applicant person
Applicant firm Siemens & Halske Aktiengesellshaft
Applicant type COMPANY
Applicant is inventor?
Original title Négyszárnyú fapropeller
English title Four-winged woodpropeller, likely a four-bladed propeller made of wood
Tech fields propellers, airplane, wood
Filing date 1917-10-06
Full specification filed date
Application number
Grant date 1920-10-15
Granted? Yes
Publication date 1921-04-30
Supplementary to patent Patent 1917-01-19 Siemens & Halske A.-G.
Related to aircraft? Yes
Serial number
Patent agent
Assigned to
National tech categories HU V/h
Family year 1917
First filing? 0
Cites these patents
Citations from after 1930
Application ID
Number of text pages
Number of diagram pages
Number of figures
Number of claims