Patent DE-1917-300978

It's fairly clear, from context and identical illustrations, that this patent matches Patent HU-1917-73345; however it's not mentioned on the scan of the original. In the patents supplementary to this one, in Germany, the ZFM patent list does mention the Hungarian original. Further checking may confirm that the actual printed German patents did not have to cite Hungarian originals, possibly for legal reasons. It's also worth noting that foreign applicants for German patents, again per ZFM, always or almost always use German agents—but their names don't appear on the final patent that we see scanned to DPMA.

Patents which are supplementary to this one

• Patent DE-1917-305476 (English title: Indicator showing average pressure measurement from engine cylinders, Filing date: 1917-06-27)
• Patent DE-1917-305477 (English title: Indicator showing average pressure measurement from engine cylinders, Filing date: 1917-06-27)

Sources

• Original patent document and Bibliographic info at DPMA
• Original patent document and bibliography entry at espacenet

Year filed	1917
Year granted	1917
Office	DE
Patent number	300978
Inventors	Emil Schimanek
Inventor country	HU
Applicant person
Applicant firm
Applicant type
Applicant is inventor?
Original title	Indikator zum Messen des mittleren Druckes in den Zylindern von Kolbenmaschinen
English title	Indicator showing average pressure measurement from engine cylinders
Tech fields	engine, instrument, gauge, pressure, ICE
Filing date	1917-02-01
Full specification filed date
Application number
Grant date
Granted?	1
Publication date	1917-10-02
Supplementary to patent	Patent HU-1917-73345
Related to aircraft?	1
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Assigned to
National tech categories	DE 42k.18
IPCs
CPCs
Family year	1917
First filing?	0
Cites these patents
Citations from after 1930
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INPADOC family ID
Number of text pages	3
Number of diagram pages	1
Number of figures	3
Number of claims	1