Abstract: An acrylate ester polymer composition having the desirable optical properties of poly(meth)acrylates and an enhanced Tg comprises a blend of a conventional PMMA polymer or copolymer with a high Tg acrylate ester polymer prepared by pyrolyzing a copolymer of methyl methacrylate and t-butyl methacrylate. The blend exhibits a single Tg, intermediate between the Tg of the conventional PMMA polymer and that of the pyrolyzed methyl methacrylate/t-butyl methacrylate copolymer. The blend can be formed into products that have good clarity, low haze and low color.
April 22, 2002
Date of Patent:
November 25, 2003
Tom V. Faris, Greg T. Gordon, David T. Chan
Abstract: In order to develop a lighting apparatus having a light source unit which has at least one light source and a first reflector, and having at least one optical element, with the light which is emitted from the light source being focused by the first reflector to form a light beam which can be influenced by the optical element further, in such a manner that the type of structure, in particular the diameter of the light outlet openings of the lamp housing, does not restrict the optical elements which can be used, said apparatus has a reflector unit having a second reflector and having a concave third reflector, with the concave third reflector having an opening for the light beam and the light beam being reflected by the second reflector onto the third reflector, and with the optical element being arranged between the light source unit and the reflector unit.
Abstract: An integrated monitoring, control and shut-down (IMCS) system for monitoring and controlling the operation of a machinery is provided. The IMCS system includes: input ports for receiving sensor signals indicative of conditions of the machinery, output ports for outputting control signals to actuators of the machinery, signal conversion means coupled to the input and output ports, for converting the input sensor signals into data samples and for converting control data into control signals. The IMCS system also includes a data processor for controlling the signal conversion means, for processing the data samples into calculated values, for sending selected calculated values to be stored into a memory and for calculating control data. A communication bus couples the hardware elements of the IMCS system.
Abstract: Soluble abrasive cleaning powder fed from a fluid-tight chamber and entrained in a stream of air is directed against a tooth surface to be cleaned from a manually controlled handpiece. The handpiece includes an improved air supply and control system having a first conduit for supplying air under pressure to the handpiece, a second conduit connected to the first for supplying air under pressure into the bottom portion of the fluid-tight chamber for entraining cleaning powder to be discharged through an outlet opening in the fluid-tight chamber and a third conduit connected to the first and to the fluid-tight chamber for directing a flow of air into the chamber at a point above the level of the cleaning powder in the chamber. A flow restricter and air filter are connected in the third conduit with the air filter being located in the fluid-tight chamber for filtering air flowing into and out of the system through the third conduit.
Abstract: An ophthalmic aqueous solution having an ionic salt ion content within the range 0.01% to 7.5% expressed as sodium chloride equivalents and comprising a non-ionic synthetic polymer such as polyvinyl alcohol and/or polyethylene glycol, and a non-ionic tonicity adjusting agent. The solution is effective in treating "dry eye" conditions by causing a normalization of irregularly structured tears and at least retarding the precipitation of potein-like substances from the aqueous layers thereof.
Abstract: Method for controlling the contraction of ophthalmic wounds or incisions by administering through an ophthalmalogically acceptable composition including a smooth muscle relaxant such as papavarine. The method also encompasses the administration to such wounds or incisions of a smooth muscle stimulant such as Seratonin.
Abstract: Disclosed herein is an improved tray for use in producing a denture either in-situ or by use of a model of the patient's mouth. The tray comprises a basic tray of disposable material approximating the shape of either the palate or the lower gums and having inner and outer wall portions integral therewith and forming a trough defining a gum receiving portion with a U-shape opening in the trough mounting, means for mounting a plurality of artificial teeth approximating the teeth found in either the upper or lower portion of the mouth, the mounting means having a flange portion made of dental acrylic which rests on the sides of the trough adjacent the U-shaped opening with the plurality of the teeth extending through the opening.
Abstract: The invention relates to soft contact lenses having a water content of at least about 45% and comprising a hydrated copolymer of a major proportion of an hydroxyalkyl acrylate or methacrylate, up to 12% by weight of an ethylenically unsaturated acid or anhydride, a minor proportion of a cross-linking monomer and a minor proportion of styrene or a substituted styrene, the free acid or anhydride groups being in salt form.
Abstract: A diagnostic means and method of testing for pregnancy in humans and a test kit incorporating such diagnostic means and ancillary materials. A sample of a patient's first morning urine is added to a test tube containing a known lyophilized reagent. The tube is capped, shaken to mix the contents, and placed upright for one to two hours. The tube is then inverted and compared with positive and negative standard vials to show either agglutination of particles, such as red blood cells, contained therein, in which case the subject is not pregnant, or a failure to agglutinate, in which event the patient is pregnant. The test tube is of sufficient dimension to support capillary action and is formed from, or has its interior surface coated with, a material which is non-wettable to the liquid contained therein.
Abstract: A building construction comprising spaced parallel structural members, such as rolled steel beams and girders, forming a plurality of horizontally disposed structural bays in which the compression flanges of the girders are restrained against lateral displacement or buckling under compressive loads by concrete joists having notched end portions, especially during construction and prior to hardening of concrete poured thereover to form floor slabs. The joists are supported by, and extend transversely between, the girders. Adjacent end portions of the joists are connected to each other to form continuous lines of tension or compression ties at selected intervals along the girders. In a preferred embodiment, the continuous ties terminate at horizontal trusses formed at the end of a row of bays by at least one diagonally disposed truss member, such as a cable.
Abstract: A system and method analyzes tonosignals and other electrical signals such as those representative of force-displacement information from applanating probes initially to determine the presence of an acceptable waveform or tonosignal. Once an acceptable waveform is found, that waveform is analyzed further to locate the point of applanation. The level of the waveform at that point may be converted to a digital signal and displayed to indicate the pressure within the eye or other objects to which the probe is applied.
Abstract: A method for treating red eye by administering to the afflicted eye a composition comprising an anti-inflammatory amount of an antagonist for H.sub.2 receptors in the eye, preferably cimetidine, and a non-toxic, pharmaceutically acceptable, ophthalmological carrier.
Abstract: A layer of thickness x.sub.j is formed at the surface of a wafer of p-type ZnTe semiconductor material and compensated so as to provide insulation with high resistivity. Ions are implanted with sufficient energy to form a trapping region of thickness x.sub.1 at the surface of the semiconductor and to form beneath the trapping region an insulating region of thickness x.sub.3, with x.sub.1 <x.sub.j. The diode has high efficiency both for emission of light having well-defined wavelengths and for current generation when subjected to light radiation.
Abstract: Hydrophobic substrate which can release at least one chemical substance, wherein it comprises a hydrophobic polymer matrix in which are homogeneously distributed inclusions of polymerized compounds of a different type to the said hydrophobic polymer and inclusions of the said substance, the polymerized compound inclusions forming in the said matrix a stable and continuous system in contact with the inclusions of the said substance.Process for the preparation of a hydrophobic substrate able to release a chemical substance, wherein it comprises forming inclusions of polymerized compounds in a hydrophobic polymer powder by grafting onto the latter a monomer of a different type to the said hydrophobic polymer, homogeneously mixing the grafted powder obtained in this way with a powder of the said substance and bringing the mixture into the form of a substrate by hot shaping it.