Abstract: This invention is directed to the production of laminated, transparent, polarizing glass articles. The inventive method contemplates five basic steps:(1) forming parallel microgrooves on a surface of a glass support;(2) washing and drying said surface;(3) depositing on said surface a mixture of organic colorants corresponding to the three primary colors and exhibiting a nematic state to yield a coating displaying polarizing properties;(4) treating the polarizing coating with an aqueous solution of inorganic salts having an acid pH; and(5) applying a continuous, optically transparent, composite film upon the polarizing coating and bonding it thereto.

Abstract: This invention is directed to the production of laminated, transparent, polarizing glass articles. The inventive method contemplates five basic steps:(1) forming parallel microgrooves on a surface of a glass support;(2) washing and drying said surface;(3) depositing on said surface a mixture of organic colorants corresponding to the three primary colors and exhibiting a nematic state to yield a coating displaying polarizing properties;(4) treating the polarizing coating with an aqueous solution of inorganic salts having an acid pH; and(5) applying a continuous, optically transparent, composite film upon the polarizing coating and bonding it thereto.

Abstract: The present invention is directed to the production of glass and glass-ceramic compositions which have particular utility as culinary utensils inasmuch as they are exceptionally easy to clean after food has been burned thereon. The products have at least an integral surface layer which contains MgO-based and/or CaO-based and/or SrO-based and/or BaO-based crystals as the predominant crystal phase. Operable compositions consist essentially, expressed in weight percent on the oxide basis, of 14.8-19.6% MgO, 16.2-20.0% Al.sub.2 O.sub.3, and 58.7-66.5% SiO.sub.2, when said surface layer contains MgO-based crystals as the predominant crystal phase, 22.2-31.6% CaO, 42.8-53.9% Al.sub.2 O.sub.3, and 23.8-33.6% SiO.sub.2, when said surface layer contains CaO-based crystals as the predominant crystal phase, 31-48% SrO, 24-35.7% Al.sub.2 O.sub.3, and 28-35% SiO.sub.2, when said surface layer contains SrO-based crystals as the predominant crystal phase, and 42.4-45% BaO, 10-15.9% Al.sub.2 O.sub.3, and 41.7-45% SiO.sub.