Abstract: An apparatus for the formation of images having a body of the apparatus provided with a corona charger, in which a corona wire is strung along a charging opening of the corona charger. An image-forming device is installed in the body of the apparatus. The device is removable from the body of the apparatus along the corona wire. The apparatus further includes a cleaning device that is attached to the end portion of the image-forming device opposite to the direction in which the image-forming device is pulled out of the body of the apparatus. The cleaning device touching the corona wire through the charging opening when the image-forming device moves along the corona wire and separating from the corona wire when the image-forming device is installed into the body of the apparatus.

Abstract: A sealing composition suitable for sealing alumina packages for integrated circuits at a temperature below about 450.degree. C. for a short time of about 10 minutes. The composition is a mixture of 50-80 wt % vitreous PbO-B.sub.2 O.sub.3 solder glass powder having a deformation point of 350.degree. C. or less, 0-45 wt % low thermal expansion ceramic powder and 2-40 wt % zircon powder. The zircon powder is of a synthetic zircon artificially prepared to eliminate radioactive impurities such as uranium and/or thorium and contains 0.5-7 wt % Fe.sub.2 O.sub.3, MnO and/or ZnO without alkali impurities and without non-reacted zirconium oxide. The composition has an improved flowability.

Abstract: A copying apparatus capable of producing a copied image on both surfaces of a copying paper as required includes a copying paper receiving and delivering device capable of receiving a copying paper returned through a copying paper returning passage and delivering it to a copying paper conveying passage. The paper receiving and delivering device includes a copying paper receiving stand supporting member disposed within a housing of the apparatus and a copying paper receiving stand to be mounted detachably on the supporting member, and the paper returned through the paper returning passage is received on the paper receiving stand. Alternatively, the paper receiving and delivering member includes a copying paper receiving stand detachably mounted on the housing and at least partly projecting out of the housing, and the paper returned through the paper returning passage is received on the paper receiving stand.

Abstract: A sealing glass composition suitable for sealing members in semiconductor devices at a temperature below about 450.degree. C. for a short time and a comparatively low thermal expansion coefficient of about 33-48.times.10.sup.-7 /.degree.C. matching with semiconductors. The sealing glass composition comprises 50-80 vol % solder glass powder and 20-50 vol % filler powder of lead calcium titanate represented by (Pb.sub.1-m Ca.sub.m)TiO.sub.3 where 0<m.ltoreq.0.4.

Abstract: A thermally crystallizable glass consisting essentially of 45-57 SiO.sub.2, 29-38 Al.sub.2 O.sub.3, 13-22 Na.sub.2 O, in parts by weight, and the parts totalling 100. For each of these 100 parts, the glass contains 0.5-5 parts of ZrO.sub.2 and 1-10 parts of ZnO. The five constituents constitute at least 95 weight percent of the total glass and a thermally crystallized glass-ceramic article suitable as kitchen ware or table ware is made from this glass.