Inventor · disambiguated record
Frederick E. Severson
Also filed as: SEVERSON FREDERICK E
25 granted patents·3 pending applications·1,073 citations·filing 1987–2014
97Inventor score
Top patents by PatentIndex Score
28 records- 0198US7770847B1Signaling and remote control train operationQS IND INC·Filed 2006·Granted Aug 10, 2010·93 cites·1 claims
- 0298US5633985AMethod of generating continuous non-looped sound effectsFiled 1995·Granted May 27, 1997·248 cites·3 claims
- 0395US8070108B2Signaling and remote control train operationSEVERSON FREDERICK E·Filed 2010·Granted Dec 6, 2011·18 cites·11 claims
- 0494US5492290AModel railroad operation using proximity selectionQS IND INC·Filed 1994·Granted Feb 20, 1996·66 cites·16 claims
- 0591US5832431ANon-looped continuous sound by random sequencing of digital sound recordsFiled 1993·Granted Nov 3, 1998·59 cites·17 claims
- 0691US5267318AModel railroad cattle car sound effectsSEVERSON FREDERICK E·Filed 1990·Granted Nov 30, 1993·64 cites·23 claims
- 0790US5896017AModel train locomotive with doppler shifting of sound effectsFiled 1995·Granted Apr 20, 1999·119 cites·6 claims
- 0888US7429931B2Proximity control of on-board processor-based model train sound and control systemSEVERSON FREDERICK E·Filed 2005·Granted Sep 30, 2008·13 cites·19 claims
- 0985US6230140B1Continuous sound by concatenating selected digital sound segmentsFiled 1998·Granted May 8, 2001·57 cites·35 claims
- 1085US5448142ASignaling techniques for DC track powered model railroadsFiled 1993·Granted Sep 5, 1995·80 cites·22 claims
- 1184US8408143B2Sound systems for model railroad locomotivesSEVERSON FREDERICK E·Filed 2012·Granted Apr 2, 2013·5 cites·8 claims
- 1284US7451708B2Sound systems for model railroad locomotivesQS IND INC·Filed 2005·Granted Nov 18, 2008·9 cites·11 claims
- 1383US4914431AElectronic control system for model railroadsSEVERSON FREDERICK E·Filed 1987·Granted Apr 3, 1990·56 cites·30 claims
- 1478US7859424B2Proximity control of on-board processor-based model train sound and control systemQS IND INC·Filed 2008·Granted Dec 28, 2010·5 cites·14 claims
- 1578US5590856AComplex switch turn-out arrangements using proximity selectionFiled 1995·Granted Jan 7, 1997·31 cites·8 claims
- 1675USRE42284ESignaling techniques for DC track powered model railroadsSEVERSON FREDERICK E·Filed 2007·Granted Apr 12, 2011·9 cites·270 claims
- 1774US9449590B1Low frequency audio sound effects in model railroadingQS IND INC·Filed 2014·Granted Sep 20, 2016·5 cites·12 claims
- 1867US7954435B2Sound systems for model railroad locomotivesQS IND INC·Filed 2008·Granted Jun 7, 2011·2 cites·8 claims
- 1967US5394068AAutomatic initialization in a model railroad motor control systemFiled 1993·Granted Feb 28, 1995·32 cites·20 claims
- 2066US8701562B2Signaling and remote control train operationQS IND INC·Filed 2013·Granted Apr 22, 2014·1 cites·3 claims
- 2166US8166887B2Sound systems for model railroad locomotivesSEVERSON FREDERICK E·Filed 2011·Granted May 1, 2012·1 cites·4 claims
- 2265US5940005AMethod and apparatus for storing and utilizing a unique power down state in a model railroad systemFiled 1995·Granted Aug 17, 1999·33 cites·8 claims
- 2364US5184048AModel railroad reversing motor control systemSEVERSON FREDERICK E·Filed 1990·Granted Feb 2, 1993·30 cites·13 claims
- 2462US9511303B2Signaling and remote control train operationQS IND INC·Filed 2014·Granted Dec 6, 2016·0 cites·22 claims
- 2559US5773939ACommand control for model railroading using AC track power signals for encoding pseudo-digital signalsFiled 1995·Granted Jun 30, 1998·37 cites·14 claims
- 2658US2013190952A1Signaling and remote control train operationSEVERSON FREDERICK E·Filed 2012·Application pending·0 cites
- 2757US2007001058A1Model railroad control and sound systemsSEVERSON FREDERICK E·Filed 2006·Application pending·0 cites
- 2856US2012016542A1Signaling and remote control train operationSEVERSON FREDERICK E·Filed 2011·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →