Abstract: Thermally stable high (beta)-cristobalite glass-ceramics suitable for making articles such as refractory linings for ovens, furnaces, and the like and which do not undergo transition to the low (alpha)-cristobalite crystal phases upon cooling of the ceramic to ambient temperature. A method for making such stable ceramics by melting a glass of the composition MO. Al.sub.2 O.sub.3.nSiO.sub.2 wherein the Al.sub.2 O.sub.3 MO molar ratio is 1, MO is CaO or a mixture of CaO and MxO where Mx is a cation of the first, second or fourth group of the Periodic Table or iron and n is a positive number of from 8 to 37, and subjecting the glass to a heat schedule sufficient to form a stabilized high (beta)-cristobalite type crystal structure in the resulting glass-ceramic, with or without a portion of low cristobalite and/or feldspar crystals.

Abstract: A rimless faceplate is mounted on a shadow mask color selection device for a color television tube construction by indexing means establishing a unique positional relationship between the faceplate and the mask. An array of cavities on the inner surface of the plate interfit with the studs on mask mounting brackets to provide transverse positioning while the bracket surfaces extending outward from the studs provide abutting surfaces to the inner face of the faceplate adjacent its stud receiving cavities to establish faceplate-mask spacing. A glass funnel receives the mask in its divergent end with precise spacing of the mask from its seal edge. Portions of the mask mounting brackets are fitted into seats in the funnel which may be cavities or depressions in the seal edge to establish the spacing, particularly the depth of entry of the mask in the funnel.

Abstract: A folder for packaging and shipping a reel of magnetic or recording tape which supports the reel of tape on both sides and prevents slipping of the tape. The folder includes a pair of hinged panels which are foldable into overlying relationship with the opposite sides of the reel of tape. At least one of the panels includes unique hub-locking tabs which fold to fit within the center opening of the reel hub to securely position the reel of tape. The areas adjacent to the hub-locking tabs are crushed to a reduced thickness to accommodate the width of the reel hub to allow the hinged panels to rest flush against the edges of the tape on the reel. The hinged panels also include mating corner-locking tabs and cutouts which cooperate to lock the panels together to form the folder.

Abstract: A method and apparatus for inspecting glass containers is described in which a high frequency field is produced at an inspection station. The high frequency signal, which may be a radio frequency signal, is fed to the antenna of a probe centrally positioned relative to the antenna and coaxial therewith. The probe, as a unit, is supported adjacent the container to be inspected and the container is rotated relative to the probe. The manner of mounting the probe relative to the bottle permits the probe to move closer or further away from the container wall, depending upon the out-of-roundness of the container and the radio frequency signal is picked up by the probe with the signal level depending upon the relative position of the probe and the wall of the container. This varying detection output is compared with a steady state detection output to derive a signal which is proportional to the relative position of the probe and the container wall.

Abstract: Disclosed are ferrimagnetic glass-ceramics prepared by the in situ, thermal crystallization of certain nickel-zinc; manganese-zinc; and manganese-magnesium crystalline ferrites in a residual glassy matrix.

Abstract: There is disclosed herein improved packages, and methods of forming same, of the type wherein a container, such as for example a glass container, like a bottle or jar, is provided externally thereof with a heat shrunk, cellular thermoplastic member, circumferentially and snugly engaging a sidewall portion of the container; the improvement resides in employing as the thermoplastic member a composite structure, or laminate, of a closed cellular polymeric layer in which the polymer is a polymer of predominantly olefin moieties and, in adhered relationship to the closed cellular layer, a non-cellular polymeric layer n which the polymer is a polymer of predominantly olefin moieties with the cellular layer being in snug, heat shrunk engagement with the sidewall portion of the container and the non-cellular layer being disposed outwardly of the cellular layer.

Abstract: A method of making a concave bottom on a blown thermoplastic container. A blowable pre-form is initially expanded against a composite mold surface defined by the end faces of a plurality of concentric tubes surrounding a central actuating rod. The rod and the tubes are initially telescopically positioned to define a composite concave surface, so that a first convex bottom is blown. Subsequently, the rod and tubes are actuated telescopically to progressively invert the convex bottom to a concave shape. The end faces of the tubes may be grooved to define reinforcing ribs in the concave bottom wall, if desired.

Abstract: There is disclosed the magnetic polarization of a tubular gaseous laser device comprising a laser capillary tube with anode and laser end pieces, a cathode, a cathode envelope, and a gas exhaust stem for filling the device with a laseable gas. Magnetic polarization of the light output from the laser is achieved by applying a magnetic field to the lasing capillary and the rotation of the laser within the magnetic field to optimize the extinction ratio.

Abstract: There is disclosed herein improved packages, and methods of forming same, of the type wherein a container, such as for example a glass container, like a bottle or jar, is provided externally thereof with a heat shrunk, cellular thermoplastic member, circumferentially and snugly engaging a sidewall portion of the container; the improvement resides in employing as the thermoplastic member a composite structure, or laminate, of a closed cellular polymeric layer in which the polymer is a polymer of predominantly olefin moieties and, in adhered relationship to the closed cellular layer, a non-cellular polymeric layer in which the polymer is a polymer of predominantly olefin moieties with the cellular layer being in snug, heat shrunk engagement with the sidewall portion of the container and the non-cellular layer being disposed outwardly of the cellular layer.

Abstract: The principles of operation of the various mechanisms are illustrated in a preferred form of an apparatus for transferring an article from an article pickup station to an article deposit station. A carrier housing is moved up and down along a vertical travel path and carries an indexing hub journally supported therein for rotation in the carrier housing. Article pickup means are provided and include one or more arms extending from the hub means and an article grasping device on each of the arms. A first one of the arms extends towards and positions the article grasping device carried thereon at a pickup station to enable article grasping when the carrier housing is at one end of the vertical travel path. In response to travel of the carrier housing in a first direction along the path the index hub is rotated to index the first arm out of the article pickup position while indexing another article grasping means on another of the plurality of arms into alignment with the pickup station.

Abstract: An improved device for detection of stones in the sidewalls of glass containers. Stones in the sidewalls of glass containers cause stress patterns to be formed. These patterns are visible if the glass container is viewed through crossed polarizing filters due to the refraction of polarized light. A television camera and electronic analysis circuit may be substituted for the human eye. The detection capability and reliability of the system is improved if the glass container is illuminated with primarily infra-red radiation. Then, polarizing filters which polarize infra-red radiation and remove visible light are used. A filter before the television camera lens removes far infra-red radiation and allows only near infra-red radiation to be measured. This makes the device insensitive to glass color, flutes or stippling and improves the signal to noise ratio.

Abstract: An apparatus for spraying between the rows of a plurality of rows of glass containers moving on a lehr mat. The spray traversing mechanism is of a commercial type which is mounted to extend through an opening in the roof of the lehr. The spraying device traverses transversely of the lehr mat. One end of the mechanism for supporting the spray traversing mechanism is pivotally mounted to a first wheeled member which is capable of being longitudinally and adjustably positioned at one side of the lehr. The other end of the traversing device is pivotally mounted to a second wheeled member, with the second wheeled member being reciprocated parallel to the direction of the movement of the lehr mat. The second wheeled member is moved at a rate such that the spray head will spray between the rows of bottles as they are moved on the lehr mat.

Abstract: Plastic containers having internal reinforcing ribs are formed by a molding operation including pre-blow and final-blow steps. The pre-blow step includes inflating a blowable plastic parison into contact with the cavity walls of a first blow mold to form a blown pre-form, the cavity walls of the first blow mold including a plurality of concave grooves to form a pattern of convex or protuberant ribs on the outer-periphery of the pre-form. The final-blow step includes positioning the blown, ribbed pre-form within a second or final blow mold having a cavity defined by substantially smooth wall surfaces conforming to the exterior configuration of the desired container. Next, the pre-form is blown to stretch and expand against the cavity walls of the second mold, during which step the convex ribs on the exterior of the pre-form are flattened, forming concave portions intermediate convex reinforcing ribs on the internal wall surface of the container.

Abstract: In the cooling of newly formed glass containers, the containers are moved from blow molds and placed on what is termed a cooling "dead plate". The dead plate is supplied with air under pressure which is fed into the casting forming the dead plate. The ware sits on a generally flat, perforate member which is the cover for the dead plate casting. The air supply is found beneath the conveyor belt in the housing for supporting the conveyor for carrying the ware away from the forming machine. A plurality of openings, adjacent each ware forming position, are provided through the bottom of the conveyor housing and air within the housing will enter the underlying, horizontal leg of the dead plate casting whose upper surface has complementary openings to those in the conveyor housing and exit through the perforations in the dead plate to cool the ware sitting thereon.

Abstract: An apparatus for blow molding a thermoplastic container having a concave bottom. A plurality of concentric, nested tubes surround a central rod, the tubes and rod have cooperating end faces which define the bottom of a blow mold. The tubes are interconnected through an actuating key fixed to the central rod and projecting through slots in the tubes. Actuation of the rod actuates the tubes in sequence as the key bottoms in the slots. A second, stop key is fixed relative to the rod and all of the tubes to position the rod and tube end faces in either a concave or convex configuration to defining two consecutive desired bottom shapes for the blow mold.

Abstract: Thermally crystallizable glasses of the Na.sub.2 O--Ta.sub.2 O.sub.5 --SiO.sub.2 and the Na.sub.2 O--Li.sub.2 O--Ta.sub.2 O.sub.5 -SiO.sub.2 systems, and glass-ceramics made therefrom which are highly transparent, have high indices of refraction, and excellent strength properties. By varying the heat treatment schedule for crystallization of a glass to a glass-ceramic, a specific high index of refraction coming within a prescribed range may be imparted to the finished transparent glass-ceramic. A transparent glass-ceramic having two or more different indices of refraction may also be produced.

Abstract: Disclosed is a technique for melting X-ray absorbing glass compositions by a process wherein molten glass is floated or supported on a bath of molten tin. The X-ray absorbing glass compositions are free of the oxides of lead, arsenic, antimony, bismuth, cadmium, and other readily reducible oxides to prevent discoloration of the glass upon contact with molten metal.

Abstract: An improved method is disclosed for forming glass bottles by the blow and blow process. A parison mold having a one-piece annular blank mold section and split neck and shoulder mold sections is charged fully with molten glass. Air is subsequently blown through a manifold covering the upper end of the parison mold to force the molten glass into an annular space defined by a cavity in the neck mold section and a neck pin projected into the neck mold cavity. The neck pin is then reciprocated from the neck mold cavity, and air is blown through the molded neck to cause the molten glass to chill its surface by pressure contact with the inside of an upright truncated pyramidal-shaped cavity formed in the blank mold section. The glass which comes into contact with the cavity walls in the blank mold section develops a very uniform enamel due to the uniform cooling achieved with the solid annular blank mold section.

Abstract: Glass compositions, free of alkali metal, are disclosed which are suitable for a wide variety of purposes, particularly in the electronics industry. The glasses have good working properties and resist uncontrolled devitrification. Characterized by low to moderate thermal expansion properties, the glass compositions generally contain the following components expressed as oxides in the indicated amounts based on the total weight of the composition:______________________________________ SiO.sub.2 50-62 Al.sub.2 O.sub.3 8-15 ______________________________________and at least one RO oxide as follows: ______________________________________ CaO 0-25 BaO 15.5-32 MgO 0-2.4 ______________________________________and wherein the sum of the RO oxides is at least 23%.