Zwick Energy Research Organization, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5222696 Flameless deicerExpiredFeb 14, 92Jun 29, 93[B64D]
5215454 Buzz suppression in burners of high capacity direct fired fluid heatersExpiredAug 26, 91Jun 01, 93[F23D]
5190249 Aircraft deicer fluid heating and propulsion systemExpiredSep 25, 89Mar 02, 93[B64D]
5098036 Flameless deicerExpiredJul 10, 87Mar 24, 92[B64D]
4924679 Apparatus and method for evacuating an insulated cryogenic hoseExpiredOct 02, 89May 15, 90[F17C]
4860545 Cryogenic storage tank with a retrofitted in-tank cryogenic pumpExpiredNov 07, 88Aug 29, 89[F17C]
4819454 Liquid cryogenic vaporizer utilizing ambient air and a nonfired heat sourceExpiredJan 22, 88Apr 11, 89[F17C]
4685292 Exhaust cooling system for internal combustion engineExpiredSep 09, 85Aug 11, 87[F01N]
4662181 Method and apparatus for extending the duration of operation of a cryogenic pumping systemExpiredDec 24, 84May 05, 87[F17C]
4609003 Method and apparatus for generation of a pneumatic feedback trigger signalExpiredJan 03, 85Sep 02, 86[F17D]
4519213 Ambient air heated electrically assisted cryogen vaporizerExpiredAug 01, 83May 28, 85[F17C]
4488576 Directional flow control valveExpiredJul 06, 81Dec 18, 84[F15B]
4448215 Multiple flow control valveExpiredJul 06, 81May 15, 84[F16K, F15B]
4374637 Burner constructionExpiredOct 31, 78Feb 22, 83[F23M]
4330008 Multiple flow and directional control valveExpiredNov 20, 79May 18, 82[F15B]
4219049 Multiple flow selection valveExpiredJul 31, 78Aug 26, 80[F16K]

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