Chugai Denki Kogyo K.K.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5366135 Method of making composite electrical contactExpiredJul 16, 93Nov 22, 94[B23K]
5268237 Composite electrical contactExpiredSep 28, 92Dec 07, 93[H01H]
5102480 Ag-SnO-CdO electrical contact materials and manufacturing method thereofExpiredJan 14, 91Apr 07, 92[H01H, C22C]
5078810 Method of making Ag-SnO contact materials by high pressure internal oxidationExpiredFeb 08, 90Jan 07, 92[C21D]
4981533 Internal-oxidation method of electrical contact materials and the materials produced therebyExpiredFeb 05, 90Jan 01, 91[C22C]
4803322 Electrical contacts for electric breakersExpiredMay 09, 85Feb 07, 89[B22F, H01H]
4695330 Method of manufacturing internal oxidized Ag-SnO system alloy contact materialsExpiredSep 30, 86Sep 22, 87[C23C]
4680162 Method for preparing Ag-SnO system alloy electrical contact materialExpiredFeb 28, 86Jul 14, 87[C21D]
4672008 Internal oxidized Ag-Sn-In system alloy electrical contact compositeExpiredOct 28, 85Jun 09, 87[C22C]
4647322 Internal oxidized Ag-SnO system alloy electrical contact materialsExpiredAug 30, 85Mar 03, 87[C22C]
4636270 Internal oxidized Ag-Sn system alloy contact materialsExpiredSep 23, 85Jan 13, 87[C22C]
4556435 Method for preparing cores and the like made from metallic oxidesExpiredOct 29, 84Dec 03, 85[C23F]
4514238 Internally oxidized Ag-Sn-Bi alloy electrical contact materialsExpiredOct 29, 84Apr 30, 85[C22C]
4479892 Ag-Metal oxides electrical contact materialsExpiredMay 16, 83Oct 30, 84[H01B]
4475991 Method of diffusion cladding a Fe-containing base material for decorative articles and ornaments with precious metal constituents including AgExpiredMar 25, 83Oct 09, 84[C25D, C23B]
4472211 Method of internally oxidizing Ag-Sn alloy contact materialExpiredMay 20, 82Sep 18, 84[C21D]
4457787 Internal oxidation method of Ag alloysExpiredSep 21, 82Jul 03, 84[C22F]
4452651 Electrical contact materials and their production methodExpiredJul 08, 82Jun 05, 84[C22C]
4452652 Electrical contact materials and their production methodExpiredDec 29, 82Jun 05, 84[C22C]
4432487 Method of overlaying stainless steel material for decorative articles and ornaments with a precious metal alloyExpiredJan 18, 82Feb 21, 84[B23K]

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