Inventor
SEVERSON FREDERICK E
US25 patents
⚠️ This page may combine multiple inventors who share the name “SEVERSON FREDERICK E”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
(unassigned)
9 patentsUS5896017AApr 20, 1999
Model train locomotive with doppler shifting of sound effects
119 citations99
US5633985AMay 27, 1997
Method of generating continuous non-looped sound effects
248 citations99
US6230140B1May 8, 2001
Continuous sound by concatenating selected digital sound segments
57 citations96
US5832431ANov 3, 1998
Non-looped continuous sound by random sequencing of digital sound records
59 citations96
US5448142ASep 5, 1995
Signaling techniques for DC track powered model railroads
80 citations96
US5940005AAug 17, 1999
Method and apparatus for storing and utilizing a unique power down state in a model railroad system
33 citations92
US5773939AJun 30, 1998
Command control for model railroading using AC track power signals for encoding pseudo-digital signals
37 citations92
US5590856AJan 7, 1997
Complex switch turn-out arrangements using proximity selection
31 citations92
US5394068AFeb 28, 1995
Automatic initialization in a model railroad motor control system
32 citations92
QS IND INC
8 patentsUS7770847B1Aug 10, 2010
Signaling and remote control train operation
QS IND INC93 citations97
US5492290AFeb 20, 1996
Model railroad operation using proximity selection
QS IND INC66 citations96
US7451708B2Nov 18, 2008
Sound systems for model railroad locomotives
QS IND INC9 citations84
US7859424B2Dec 28, 2010
Proximity control of on-board processor-based model train sound and control system
QS IND INC5 citations73
US9449590B1Sep 20, 2016
Low frequency audio sound effects in model railroading
QS IND INC5 citations64
US8701562B2Apr 22, 2014
Signaling and remote control train operation
QS IND INC1 citations62
US7954435B2Jun 7, 2011
Sound systems for model railroad locomotives
QS IND INC2 citations62
US9511303B2Dec 6, 2016
Signaling and remote control train operation
QS IND INC0 citations52
SEVERSON FREDERICK E
8 patentsUS5267318ANov 30, 1993
Model railroad cattle car sound effects
SEVERSON FREDERICK E64 citations96
US4914431AApr 3, 1990
Electronic control system for model railroads
SEVERSON FREDERICK E56 citations96
US8070108B2Dec 6, 2011
Signaling and remote control train operation
SEVERSON FREDERICK E18 citations92
US5184048AFeb 2, 1993
Model railroad reversing motor control system
SEVERSON FREDERICK E30 citations92
US8408143B2Apr 2, 2013
Sound systems for model railroad locomotives
SEVERSON FREDERICK E5 citations84
US7429931B2Sep 30, 2008
Proximity control of on-board processor-based model train sound and control system
SEVERSON FREDERICK E13 citations84
USRE42284EApr 12, 2011
Signaling techniques for DC track powered model railroads
SEVERSON FREDERICK E9 citations82
US8166887B2May 1, 2012
Sound systems for model railroad locomotives
SEVERSON FREDERICK E1 citations62