Inventor · disambiguated record
Stefan Spannhake
Also filed as: SPANNHAKE STEFAN
9 granted patents·1 pending application·179 citations·filing 1997–2011
88Inventor score
Top patents by PatentIndex Score
10 records- 0194US6267219B1Electronic safety system for escalatorsOTIS ELEVATOR CO·Filed 2000·Granted Jul 31, 2001·94 cites·15 claims
- 0266US6591947B2Use of multi-state sensorsOTIS ELEVATOR CO·Filed 2002·Granted Jul 15, 2003·13 cites·7 claims
- 0363US9059584B2Circuit arrangement for limiting the overvoltage of an excitation winding of a synchronous machine having rapid de-excitationSPANNHAKE STEFAN·Filed 2011·Granted Jun 16, 2015·5 cites·11 claims
- 0455US6626279B2Process for switching between main supply and a frequency inverter and vice versa for an escalator driveOTIS ELEVATOR CO·Filed 2000·Granted Sep 30, 2003·10 cites·22 claims
- 0555US5883345ASonic position measurement systemOTIS ELEVATOR CO·Filed 1997·Granted Mar 16, 1999·40 cites·15 claims
- 0651US7650954B2Method for controlling the drive power distribution in a motor vehicle with hybrid driveIAV GMBH·Filed 2006·Granted Jan 26, 2010·4 cites·5 claims
- 0750US9531304B2Method and device for operating an electrical machine having separate excitationHERRANZ GRACIA MERCEDES·Filed 2011·Granted Dec 27, 2016·2 cites·13 claims
- 0846US6634463B2Switch over from the mains supply to a frequency converter by a phase correction process for an escalator driveOTISCELECATOR COMPANY·Filed 2002·Granted Oct 21, 2003·8 cites·19 claims
- 0944US6782989B2Process for switching between mains supply and a frequency inverter and vice versaOTIS ELEVATOR CO·Filed 2002·Granted Aug 31, 2004·3 cites·25 claims
- 1031US2012187769A1Energy Supply SystemSPANNHAKE STEFAN·Filed 2010·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →