Patent US-1893-507609

• front and rear propellers operate concurrently (one pushes, the other pulls); conical shape with cylindrical compartment within; hinged propeller blades "will set themselves automatically at right angles to the shafts, so that the blades are acting exactly similar to the blades of a screw propeller"
• Inventor location (imputed by HistPat): Hottingen, Switzerland ; Hottingen is presently a quarter in District 7 in Zürich, having been a municipality of its own, then incorporated into Zürich in 1893. This incorporation into Zurich may or may not have taken place later in the year, after this patent's having filed ; we have data on later patents which reflect the situation of Hottingen as within Zürich.
• Witnesses as shown on the final text page: H. Rabhart and P. Gnâchig

Sources

• Patent 507609 document and bibliographic info on espacenet
• Patent 507609 at google patents
• Short's DB
• PTO 244

Patents which are supplementary to this one

• Patent CH-1893-6380 (English title: Dirigible airship, Filing date: 1893-06-12)

References

Year filed	1893
Year granted	1893
Office	US
Patent number	507609
Inventors	Carl Friedrich Billwiller
Inventor country	CH
Inventor location	Hottingen, Zurich, Hottingen-Zürich, Canton of Zurich
Applicant person	Carl Friedrich Billwiller
Applicant firm
Applicant type	INDIV
Applicant is inventor?	Yes
Original title	Navigable Air-Ship
English title	Navigable Air-Ship
Tech fields	LTA, cargo, propeller, propulsion, frame
Filing date	April 20, 1893
Full specification filed date
Application number
Grant date	October 31, 1893
Granted?	Yes
Publication date
Supplementary to patent
Related to aircraft?	Yes
Serial number	471062
Patent agent
Assigned to
National tech categories	USPC 244/26
IPCs
CPCs	CPC B64B1/00
Family year	1893
First filing?	Yes
Cites these patents
Citations from after 1930
Application ID	46428301
INPADOC family ID
Number of text pages	2
Number of diagram pages	2
Number of figures	7
Number of claims	2