Abstract: In a glass front-panel for a cathode ray tube, whose surface layer contains more potassium ions than those in the interior thereof, and whose flange is stuck to a rear panel to form a vacuum vessel, only the surface layer of the flange portion is substantially removed, or in a glass front-panel for a cathode ray tube, comprising an image displaying portion, a side wall portion and a flange portion, a belt-like electrode for making a gradient of electric potential easier is disposed on a surface of the side wall portion, so that the cathode ray tube is prevented from being damaged due to dielectric breakdown.

Abstract: A method of bonding a glass and a metal with a low-melting glass frit, in which the low-melting glass frit contains from 1 to 10% by weight of an aluminum borate whisker, and the difference in linear expansion coefficient between the low-melting glass frit and the glass is 10.times.10.sup.-7 /.degree.C. or less; and a method for producing a cathode ray tube comprising the step of bonding a glass back plate and a metal stud pin with a low-melting glass frit, the low-melting glass frit containing from 1 to 10% by weight of an aluminum borate whisker, and the difference in linear expansion coefficient between the low-melting glass frit and the glass back plate being 10.times.10.sup.-7 /.degree.C. or less.

Abstract: A glass panel resistant to coloring when irradiated with electron rays, which has the following glass composition:______________________________________ SiO.sub.2 64-75% by weight Al.sub.2 O.sub.3 1.5-2.0% by weight CaO 6.5-9.0% by weight MgO 0-5.0% by weight Li.sub.2 O 0.5-2.5% by weight Na.sub.2 O 7.0-12% by weight K.sub.2 O 2.1-5.0% by weight SrO + BaO + ZrO.sub.2 0-10% by weight CeO.sub.2 0-0.5% by weight, ______________________________________wherein part of the Na ion, in at least the surface layer of the panel region to be irradiated with electron rays, is substituted with K ion by an ion exchange treatment in a K-containing molten salt so that the molar ratio of Na ion and K ion expressed by Na.sub.2 O/(Na.sub.2 O+K.sub.2 O) in at least the glass layer ranging from 0.5 .mu.m to 6.5 .mu.m in depth from the panel surface, of said panel region to be irradiated with electron rays, is 0.3-0.75.

Abstract: In a glass front-panel for a cathode ray tube, whose surface layer contains more potassium ions than those in the interior thereof, and whose flange is stuck to a rear panel to form a vacuum vessel, only the surface layer of the flange portion is substantially removed, or in a glass front-panel for a cathode ray tube, comprising an image displaying portion, a side wall portion and a flange portion, a belt-like electrode for making a gradient of electric potential easier is disposed on a surface of the side wall portion, so that the cathode ray tube is prevented from being damaged due to dielectric breakdown.

Abstract: A glass pressure vessel for a cathode ray tube comprising a concave glass and a rectangular glass back-plate to be bound to the concave glass with glass Frit, satisfies the following inequalities,1000 W/(Lt.sub.2).gtoreq.2.8t.sub.1 .gtoreq.0.8 t.sub.2where t.sub.1 (mm) is the thickness of the concave glass, L (mm) and t.sub.2 (mm) are the length of the short side and the thickness of the back-plate, respectively, and W (mm) is a bond width in which the flange portion of the concave glass and the back-plate are bonded together.

Abstract: A process for producing a glass article protected from coloring by electron rays comprises preparing a soda-lime-silica glass, contacting the glass with a molten salt containing potassium ions so that sodium ions in a surface layer thereof are exchanged by potassium ions, and subjecting the glass to heat treatment so that the surface layer thereof in a depth to which the irradiated electron rays penetrate when electron rays are irradiated has a composition defined by a molar ratio of 0.4 to 0.65 for Na.sub.2 O/(Na.sub.2 O+K.sub.2 O). The soda-lime-silica glass is composed of 50-75% by weight of SiO.sub.2, 0.5-2.5% by weight of Al.sub.2 O.sub.3, 0-0.1% by weight of Fe.sub.2 O.sub.3, 5.0-14.0% by weight of CaO, 0-4.5% by weight of MgO, 5.0-16.0% by weight of Na.sub.2 O, 0-2.0% by weight of K.sub.2 O, 0-0.5% by weight of TiO.sub.2, and 0-0.5% by weight of SO.sub.3. The content of alkali metal oxides in the glass is 5% and above, and ratio of Na.sub.2 O in the alkali metal oxides is 65% and above.

Abstract: The instant invention relates to soda-lime-silica glass articles, having a surface which is resistant to coloring by electron rays which is suitable for use as the glass panel of a cathode ray tube. Said glass article being produced by a float process, and said surface having the sodium ions exchanged with lithium and at least one of potassium, rubidium, and cesium ions. In another aspect of the invention a soda-lime-silica glass containing 0.2-1.5% by weight of Li.sub.2 O having the sodium ions in at least one surface exchanged with potassiums is produced, such that the ratio of Na.sub.2 O/(Na.sub.2 O+K.sub.2 O) is 0.2-0.6 for a depth of 0.5 microns from said surface.

Abstract: In a method of forming a glass product having a smooth surface according to this invention, a glass plate is placed on a male mold which is formed to have dimensions corresponding to the inner dimensions of the glass product and contacts its inner peripheral edge portion, an outer peripheral portion to be deformed of the glass plate is heated to a temperature higher than that of a central portion, serving as the smooth surface, of the glass plate so as to be deformed on the male mold by its weight, and the deformed glass plate is pressed by a female mold formed to have dimensions corresponding to the outer dimensions of the glass product.

Abstract: A mold for producing a glass article having an opening and a protruding hollow portion, said mold comprising(A) a female mold comprised of a main female mold member and an auxiliary female mold member, the inside shapes of the depressed portions of the two female mold members substantially defining the outside shape of the glass article,(B) a male mold defining the inside shape of that part of the glass article, and(C) a gas exhaust port formed in an inmost position of the depressed portion of the auxiliary female mold member, and/or(D) a gas introducing port formed in the male mold in a position facing the depressed portion of the auxiliary female mold member.And a method for producing the glass article by using the mold.

Abstract: A laminated panel composed of a plastic sheet and a glass sheet bonded to each other through an adhesive layer having a thickness of not more than about 200 microns and composed of a thermoplastic resin having a softening point of less than about 100.degree. C., containing substantially no plasticizer and being plastic at room temperature, said plastic sheet being composed of a resin having a higher softening point than said thermoplastic resin.