Abstract: A transparent, ultraviolet-absorbing, fixed tint glass that is particularly useful in an ophthalmic lens and has a composition, expressed in weight percent on an oxide basis, consisting essentially of______________________________________ SiO.sub.2 65-75 Al.sub.2 O.sub.3 0-2 Na.sub.2 O 5-11 V.sub.2 O.sub.5 1.5-3.5 K.sub.2 O 5-13 MnO.sub.2 1-4 Na.sub.2 O + K.sub.2 O 14-20.

Abstract: This invention is directed to a transparent glass which, at a thickness of 2 mm, transmits less than 1% of ultraviolet radiation having a wavelength of 380 nm and exhibits a green fixed tint bounded by apices A,C,D,E,A of the drawing, a purity between 18-32%, and a dominant wavelength between 554-564 nm, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 65-72 Na.sub.2 O + K.sub.2 O 15-21 B.sub.2 O.sub.3 3-8 CaO 0-4 Al.sub.2 O.sub.3 0.5-5 ZnO 0-9 Na.sub.2 O 6-12 CaO + ZnO 1-5 K.sub.2 O 6-12 Fe.sub.2 O.sub.3 4.8-7.

Abstract: A transparent glass which, at a thickness of 2 mm, transmits less than 1% of ultraviolet radiation having a wavelength of 380 nm and exhibits a brown fixed tint bounded by apices A, B, D, F, A of the drawing, a purity between 48-70%, and a dominant wavelength between 580-588 nm, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 65-72 CaO 0-5.5 B.sub.2 O.sub.3 3-8 ZnO 0-4 Na.sub.2 O 6-10 CaO + ZnO 2-5.5 K.sub.2 O 7-12 Fe.sub.2 O.sub.3 3-5 Na.sub.2 O + K.sub.2 O 15-20 Se 0.01-2 Al.sub.2 O.sub.3 0-4 NiO 0-0.12.

Abstract: A non-photochromic R.sub.2 O-B.sub.2 O.sub.3 -SiO.sub.2 glass containing a cuprous or cuprous-cadmium halide crystal phase, having a sharp spectral cutoff at about 400 nm, the glass composition consisting essentially of, in cation percent, 35-73% SiO.sub.2, 15-45% B.sub.2 O.sub.3, 0-12% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being less than 10% when the SiO.sub.2 is over 55%, 0-12% Li.sub.2 O, 0-20% Na.sub.2 O, 0-12% K.sub.2 O, the Li.sub.2 O+Na.sub.2 O+K.sub.2 O being 4.75-20%, 0-5% CaO+BaO+SrO, 0.125-1.0% Cu.sub.2 O, 0-1% CdO, 0-5% ZrO.sub.2, 0-0.75% SnO.sub.2, 0-1% As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3, the glass containing 0-1.75%. Cl, 0-1.0% Br, 0.25-2.0% Cl+Br and 0-2% F by weight, and having an R-value, calculated in mole percent of 0.15-0.45, the R-value not exceeding 0.30, except as the glass composition meets at least one condition selected from the group: up to 12 cation % Li.sub.2 O, less than 10 cation % Al.sub.2 O.sub.3, at least 0.3 cation % Cu.sub.2 O and 0.50-2.0% Cl+Br.

Abstract: A non-photochromic R.sub.2 O--B.sub.2 O.sub.3 --SiO.sub.2 glass containing a cuprous or cuprous-cadmium halide crystal phase, having a sharp spectral cutoff at about 400 nm, the glass composition consisting essentially of, in cation percent, 35-73% SiO.sub.2, 15-45% B.sub.2 O.sub.3, 0-12% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being less than 10% when the SiO.sub.2 is over 55%, 0-12% Li.sub.2 O, O-20% Na.sub.2 O, 0-12% K.sub.2 O, the Li.sub.2 O+Na.sub.2 O+K.sub.2 O being 4.75-20%, 0-5% CaO+BaO+SrO, 0.125-1.0% Cu.sub.2 O, 0-1% CdO, 0-5% ZrO.sub.2, 0-0.75% SnO.sub.2, 0-1% As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3, the glass containing 0-1.75% Cl, 0-1.0% Br, 0.25-2.0% Cl+Br and 0-2% F by weight, and having an R-value, calculated in mole percent of 0.15-0.45, the R-value not exceeding 0.30, except as the glass composition meets at least one condition selected from the group: up to 12 cation % Li.sub.2 O, less than 10 cation % Al.sub.2 O.sub.3, at least 0.3 cation % Cu.sub.2 O and 0.50-2.0% Cl+Br.

Abstract: Thermally induced color is developed in a glass article containing a silver halide crystal phase by including in the glass batch a thermal reducing agent, retaining the thermal reducing agent in its lower valence state while meltinq the batch and forming the glass article and subsequently heat treating the article to partially reduce the silver halide crystal phase.

Abstract: This invention is directed to the production of transparent glasses which can be chemically strengthened within a period of time not exceeding four hours to develop a surface compression layer having a sufficient depth to survive the Drop Ball Test after abrasion, the glasses consisting essentially, in weight percent, of______________________________________ SiO.sub.2 55-65 CaO 0-1.5 B.sub.2 O.sub.3 5-20 MgO 0-4 Al.sub.2 O.sub.3 4-10 TiO.sub.2 0-4 B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 14-26 ZrO.sub.2 0-7 Li.sub.2 O 0-3 MgO + TiO.sub.2 + ZrO.sub.2 0-10 Na.sub.2 O 6-18 As.sub.2 O.sub.3 0-0.5 K.sub.2 O 2-10 ZnO 0-1.5 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 13-22. ______________________________________Where desired, 3.5-5.5% Fe.sub.2 O.sub.3 may be included to yield glasses which, at a thickness of 2 mm, will not transmit more than 1% of ultraviolet radiation at a wavelength of 380 nm. Where an ultraviolet absorbing glass exhibiting a neutral gray, fixed tint is desired, 0.02-0.035% Co.sub.3 O.sub.4 and 0.08-0.

Abstract: A silver halide photochromic glass hasa. a clear luminous transmittance of about 90%,b. A darkened luminous transmittance at 20.degree. C. below about 25%.c. A fading rate at 20.degree. C. such that, after a five minute fading interval, the glass exhibits a percent faded luminous transmittance that is no more than the darkened luminous transmittance percentage plus 15. The glass has an R.sub.2 O--Al.sub.2 O.sub.3 --B.sub.2 O.sub.3 --SiO.sub.2 base composition, contains as additives, in percent by weight, 0.1-0.3% Ag, 0.25-1.0% Cl, 0-0.2% Br, 0.25-1.0% Cl+Br, the ratio of Ag:(Cl+Br) being 0.15-0.65, 0.003-0.015% CuO and 0.1-1.0% PbO and the total R.sub.2 O content is 8-13.5%, wherein R.sub.2 O consists of Li.sub.2 O+Na.sub.2 O +K.sub.2 O.

Abstract: A transparent glass which, at a thickness of 2 mm, does not transmit more than about 1% of ultraviolet radiation at a wavelength of 380 nm and exhibits a neutral gray, fixed tint bounded by apices A, B, C, D, A of the drawing, a purity no higher than 6, and a luminous transmittance between 10-16, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 65-72 CaO 0-1.5 B.sub.2 O.sub.3 2-6 Al.sub.2 O.sub.3 + CaO 0.2-2.25 Na.sub.2 O 6-10 As.sub.2 O.sub.3 0-0.3 K.sub.2 O 10-16 Fe.sub.2 O.sub.3 4.8-6.2 Na.sub.2 O + K.sub.2 O 17-23 Co.sub.3 O.sub.4 0.012-0.02 K.sub.2 O:Na.sub.2 O 1.25-2.25 NiO 0.16-0.21 Al.sub.2 O.sub.3 0-2.25 ZnO 0-1.5.

Abstract: This invention is directed to a glass containing elongated silver halide crystals selected from the group consisting of AgCl, AgBr, AgI, and mixtures thereof which is capable of polarizing radiation in the visible portion of the radiation spectrum and which does not exhibit photochromism when exposed to radiation in the ultraviolet/visible portions of the radiation spectrum, wherein the composition of the glass is essentially free of copper and includes an amount of CeO.sub.2 effective to retain the silver in the glass composition in the oxidized state.

Abstract: A composition for a photochromic glass consisting essentially of, in approximate calculated weight percent, about:______________________________________ SiO.sub.2 54-58% Ag 0.18-0.33% B.sub.2 O.sub.3 18-22% Cl 0.25-0.50% Al.sub.2 O.sub.3 7-8% Br 0.04-0.12% Li.sub.2 O 3.75-4.5% CuO 0.007-0.012% Na.sub.2 O 0-1% PbO 0-0.08% K.sub.2 O 5.5-7.5% Sb.sub.2 O.sub.3 0-0.20% TiO.sub.2 0-2% Pd 1-6 ppm ZrO.sub.2 2-4.5% ______________________________________plus 0-1.0% Er.sub.2 O.sub.3 and/or 0-10 ppm Au, the mole ratio of Li.sub.2 O:Na.sub.2 O being equal to or greater than 9:1 and the glass having a coloration in the fully darkened state corresponding to chromaticity coordinates, in accordance with the 1931 C.I.E. trichromatic colorimetric system, that fall within the trapezoid ABCDA in the drawing for a 1.1 mm glass thickness, and within the trapezoid EFGHE for a 2 mm glass thickness.

Abstract: This invention relates to the production of glasses exhibiting a refractive index between about 1.66-1.81, a softening point between about 625.degree.-675.degree. C., a strain point between about 455.degree.-490.degree. C., a linear coefficeint of thermal expansion (25.degree.-300.degree. C.) between about 53-65.times.10.sup.-7 /.degree.C., and good chemical durability which consist essentially, in weight percent, of:______________________________________ SiO.sub.2 24-42 Li.sub.2 O 0.2 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 0-3.5 Al.sub.2 O.sub.3 3-7.5 Na.sub.2 O 0-2 ZrO.sub.2 0-2.5 B.sub.2 O.sub.3 2-7.5 K.sub.2 O 0-3 TiO.sub.2 0-8 PbO 35-57 La.sub.2 O.sub.3 0-8 La.sub.2 O.sub.3 + ZrO.sub.2 4-12.sub.

Abstract: A beam detection apparatus for sensing the position of an electron beam within a cathode ray tube is disclosed. The apparatus includes a photodetector for optically detecting the intersections of the electron beam with a graticule line on the faceplate of the cathode ray tube. In a second embodiment, an electrically conductive pattern of reference markers is applied to the graticule for intercepting the beam and a detector is coupled to the conductive pattern for detecting the interception. Calibration circuitry is also included to generate input signals to deflection amplifiers coupled to the cathode ray tube and to evaluate detection signals generated by the beam coinciding with a graticule line. The calibration circuitry compares the input signals to the input signal value represented by the graticule line and adjusts the deflection amplifiers of the cathode ray tube accordingly to cause the beam to coincide with a graticule line bearing a predetermined relationship to the input signal deflecting the beam.

Abstract: Photochromic glass compositions for thin refractive-index-corrected lens elements consisting essentially of about:______________________________________ SiO.sub.2 54-58% B.sub.2 O.sub.3 18-22% Al.sub.2 O.sub.3 7-8% Li.sub.2 O 3.75-4.5% Na.sub.2 O 0-1% K.sub.2 O 5.5-7.5% TiO.sub.2 0-2% ZrO.sub.2 2-4.5% Ag 0.20-0.33% Cl 0.30-0.50% Br 0.04-0.12% CuO 0.007-0.012% PbO 0-0.08% Sb.sub.2 O.sub.3 0-0.20% ______________________________________having a Li.sub.2 O:Na.sub.2 O molar ratio of at least 9:1 and exhibiting good darkening, fast fading, good chemical strengthenability and neutral dark-state coloration at thicknesses on the order of 1 mm, are described.

Abstract: There is disclosed a method of producing a photochromic glass having a reduced transmittance for ultraviolet radiation while having substantially unimpaired photochromic properties. The method comprises providing a combination of 0.1-1.0% CeO.sub.2 and 0.1-1.5% Sb.sub.2 O.sub.3 and/or As.sub.2 O.sub.3 as part of the glass composition. In an embodiment utilizing minimal silver content, the glass article in thicknesses of 1.3 to 2.0 mm. can be chemically strengthened to surpass the impact specification imposed by the Federal Food and Drug Administration for eyewear, will transmit less than 0.2% of radiation having wavelengths between 290-315 nm, and will demonstrate a darkened luminous transmittance at 20.degree.-25.degree. C. below 35% and a fading rate such that after five minutes the luminous transmittance will be at least 1.75 times that of the darkened transmittance. These glasses consist essentially of:______________________________________ SiO.sub.2 55-61 Ag >0.1-<0.2 B.sub.2 O.sub.3 18-21 Cl 0.

Abstract: This invention is directed to the preparation of haze-free photochromic glasses which darken to a comfort range, i.e., a luminous transmittance of about 40-60%, which exhibit very rapid fading, and which demonstrate excellent temperature dependence. The glasses consist essentially, in weight percent with the levels of Ag, Cu.sub.2 0, C1, and Br representing values as analyzed in the glass, of:______________________________________ Li.sub.2 O 0-2.5 P.sub.2 O.sub.5 0-25 Na.sub.2 O 0-9 SiO.sub.2 20-65 K.sub.2 O 0-17 Ag 0.115-0.145 Cs.sub.2 O 0-6 Br 0.11-0.155 Li.sub.2 O + Na.sub.2 O + K.sub.2 O + Cs.sub.2 O 8-20 B.sub.2 O.sub.3 14-23 Cu.sub.2 O 0.007-0.011 Al.sub.2 O.sub.3 5-25 Cl 0.1-0.15 ______________________________________and wherein the molar ratio alkali metal oxide: B.sub.2 0.sub.3 ranges between about 0.55-0.85, the weight ratio Ag:(C1+Br) ranges between about 0.65-0.95, and the sum of Ag+Br is at least 0.26%, when the Br content is 0.11%, and at least 0.25% when the Ag content is 0.115%.

Abstract: A signal processing system employing charge transfer devices for fast-in slow-out operation is disclosed. A push-pull input analog signal is applied to two charge transfer devices, and the clock pulses applied thereto are shifted one-half clock cycle with respect to one another. The output signals from the two charge transfer devices are differentially summed, and thereby providing cancellation of dark current and clock related noise in the charge transfer device, and doubled sample rate.

Abstract: This invention is directed to the production of transparent photochromic glasses containing silver halide crystals sensitized with copper having base compositions within the alkali metal aluminoborosilicate system wherein at least 0.025% As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3 is present in the composition to insure that more than 50% of the copper is present in the Cu.sup.+ state. Where an oxidizing agent is added to the composition, the amount of As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3 will be increased to reduce that agent plus insure that more than 50% of the copper is present in the Cu.sup.+ state.

Abstract: This invention is directed to transparent glass which, after thermal tempering demonstrates a tint defined by C.I.E. chromaticity coordinates and transmission utilizing Illuminant C ofx=0.3300.+-.0.0040y=0.3360.+-.0.0040Y=60.8.+-.4The glass consists essentially, in weight percent on the oxide basis, of______________________________________ SiO.sub.2 75 .+-.2.0 Na.sub.2 O 13.45 .+-. 0.5 Al.sub.2 O.sub.3 165 .+-. 0.2 CaO 9.6 .+-. 0.3 As.sub.2 O.sub.3 0.15 .+-. 0.1 NiO 0.03 .+-. 0.005 with Cr.sub.2 O.sub.3 0.002 .+-. 0.0005 or CuO 0.005 .+-. 0.

Abstract: This invention is concerned with the production of transparent glass articles exhibiting an integral light gray-brown hue. More particularly, this invention is drawn to specific borosilicate-based glass compositions containing critically-defined amounts of Co.sub.3 O.sub.4, NiO, and MnO.sub.2 as colorants therefor. The resulting glasses exhibit a specifically-delineated transmittance curve in the visible portion of the radiation spectrum.