Stefan Spannhake — 9 Patents at Otis Elevator

Stefan Spannhake has been granted 9 US patents while listed as an inventor at Otis Elevator. The first was granted in 1999 and the most recent in December 2016. Stefan Spannhake ranks #535,341 of 4,157,543 US inventors in our database (top 12.9%). Patent records list Stefan Spannhake in Markgröningen, DE.

Issued Patents All Time

Showing 1–9 of 9 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
9531304	Method and device for operating an electrical machine having separate excitation	Mercedes Herranz Gracia, Stefan Kolmorgen, Yves Challand, Daniel Raichle, Mario Beyer +3 more	2016-12-27
9059584	Circuit arrangement for limiting the overvoltage of an excitation winding of a synchronous machine having rapid de-excitation	Jochen Fassnacht, Hans-Peter Mueller	2015-06-16
7650954	Method for controlling the drive power distribution in a motor vehicle with hybrid drive	Axel Ibenthal, Thomas Proske, Matthias Schultalbers	2010-01-26
6782989	Process for switching between mains supply and a frequency inverter and vice versa	Herbert Horbrugger, Reinhard Henkel	2004-08-31	$86,353,000
6634463	Switch over from the mains supply to a frequency converter by a phase correction process for an escalator drive	Michael Mann, Gunter Blechschmidt, Peter Walden, Robert Oesterle, Michael Bernhard Kocur	2003-10-21	$87,022,000
6626279	Process for switching between main supply and a frequency inverter and vice versa for an escalator drive	Reinhard Henkel, Ralph S. Stripling, Richard Markus	2003-09-30	$46,874,000
6591947	Use of multi-state sensors	Herbert Horbrugger, Peter Herkel	2003-07-15	$111,372,000
6267219	Electronic safety system for escalators	Reinhard Henkel, Jurgen Gewinner	2001-07-31	$124,090,000
5883345	Sonic position measurement system	Uwe Schonauer	1999-03-16	$15,156,000

Stefan Spannhake — 9 Patents

Issued Patents All Time

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