Northgate Research, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5393008 Reel-up with separately acting actuators for influencing linear pressureExpiredSep 16, 92Feb 28, 95[B65H]
4966132 Remote spark shock wave generatorExpiredDec 01, 88Oct 30, 90[A61B]
4930509 X-ray aiming fixtureExpiredJan 23, 89Jun 05, 90[A61B]
4905674 Electrode construction for replacement of worn electrodes in a lithotripterExpiredDec 01, 88Mar 06, 90[A61B]
4798196 Shroud for coupling kidney stone disintegrator to human bodyExpiredDec 16, 86Jan 17, 89[A61B]
4763652 Aiming system for kidney stone disintegratorExpiredApr 16, 86Aug 16, 88[A61B]
4715375 Degassification of water in hydraulic spark gap shock wave generatorExpiredNov 07, 86Dec 29, 87[A61B]
4715376 Isolation of gas in hydraulic spark gap shock wave generatorExpiredNov 07, 86Dec 29, 87[A61B]
4696299 Non-invasive destruction of kidney stonesExpiredApr 03, 86Sep 29, 87[A61B]
4693247 Triggering circuitExpiredSep 29, 86Sep 15, 87[A61B]
4620545 Non-invasive destruction of kidney stonesExpiredOct 31, 84Nov 04, 86[A61B]

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