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| Number | Title | Issue Date |
| 4246696 | Process for manufacturing open-air compound insulators Open-air compound insulators are made treating a prefabricated glass-filter rod with silane, extruding a rubber layer on the rod, strengthening the rubber layer and bonding prefabricated screens to the rubber layer by vulcanization.... | 01/27/1981 |
| 4225981 | Endo prothesis with a metal-ceramic union In a bone joint endoprosthesis, the spigot of the metal shank is externally threaded to mate with a thread inside the ceramic head of the prosthesis; the thread on the spigot has greater depth in the radial direction, with flat sides, and the depth of the... | 10/07/1980 |
| 4170794 | Bone joint endoprosthesis A bone joint endoprosthesis comprises a spherical body of the joint with hole in it for receiving a shaft spigot; a shaft is embedded in bone; the shaft has a spigot which is received in the hole; a spreader, comprised of a material that swells when it is... | 10/16/1979 |
| 4001491 | One or multi-part composite umbrella-shaped insulator Composite insulator having a plurality of umbrella-shaped sections on a trunk; each section is comprised of a mould filled with a hardenable material which adheres to the mould and the trunk; shaping the mould to receive the hardenable material.... | 01/04/1977 |
