Uentech Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5713415 Low flux leakage cables and cable terminations for A.C. electrical heating of oil depositsExpiredJul 24, 96Feb 03, 98[E21B]
5621844 Electrical heating of mineral well deposits using downhole impedance transformation networksExpiredMar 01, 95Apr 15, 97[E21B]
5099918 Power sources for downhole electrical heatingExpiredJan 25, 91Mar 31, 92[E21B]
5070533 Robust electrical heating systems for mineral wellsExpiredNov 07, 90Dec 03, 91[H05B, E21B]
5012868 Corrosion inhibition method and apparatus for downhole electrical heating in mineral fluid wellsExpiredMar 14, 89May 07, 91[E21B]
4919201 Corrosion inhibition apparatus for downhole electrical heatingExpiredMar 14, 89Apr 24, 90[E21B]
4821798 Heating system for rathole oil wellExpiredJun 09, 87Apr 18, 89[E21B]
4793409 Method and apparatus for forming an insulated oil well casingExpiredJun 18, 87Dec 27, 88[F16L, H05B, E21B]
4790375 Mineral well heating systemsExpiredNov 23, 87Dec 13, 88[E21B]

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