Abstract: An improved rotor blade assembly and method of making same. The rotor blade includes protective layers which comprise a metal tail having a mesh bonded to its inside surface. The protective layer is pre-shaped and applied to the forward surface of the blade.

Abstract: A foldup cover blank for placement about a jacket for holding a cassette. The jacket may include indicia which corresponds to a label which is applied to the jacket. The foldup cover blank may be provided as kit which includes a blank cassette.

Abstract: An orthodontic bracket and method of making same wherein the bracket has at least one tie wing integrally formed with a base portion. In one form of the invention the bracket is provided with at least one longitudinally extending groove which extends into the base portion, the groove having at least a portion extending beyond at least a portion of the groove opening. Another aspect of the present invention is directed to a method of making an orthodontic bracket using only ultrasonic machining techniques.

Abstract: Method and apparatus for measuring the level of a cryogenic liquid in a container using frequency pulses. The time interval between the transmitted and echoed pulse is measured and compared with predetermined store values which are characteristics of the container of known geometry.

Abstract: A fluid driven tank cleaning which includes a housing having a fluid receiving chamber, and inlet for connecting the receiving chamber to a source of fluid under pressure, and a secondary chamber separated from the receiving chamber by a common wall as a primary drive shaft rotatably mounted within the receiving chamber. A drive impeller is connected to the primary drive shaft and disposed within the inlet is provided for rotating the primary drive shaft in response to fluid entering the housing. A second drive shaft is rotatably mounted within the secondary chamber. A magnetic drive coupler is provided for magnetically coupling the primary shaft with the secondary shaft such that the secondary shaft will rotate in response to rotation of the primary shaft. A fluid nozzle assembly is rotatably mounted to the housing and is fluidly connected to the receiving chamber. A drive train is provided for rotating the fluid nozzle assembly in response to the rotation of the secondary shaft is also provided.

Abstract: A glass slide having a top surface and a bottom surface. The slide has at least one marking surface which has a first visual appearance when viewed from the top, and a second visual appearance when viewed from the bottom so as to allow the surface to be easily distinguished.

Abstract: A coupling device for converting a three-point hitch to either a ball or pin type hitch. The coupling device includes a main longitudinally extending support member having a forward end and a rearward end. The forward end has a ball or pin secured thereto. The forward end is designed to be secured to the forward ends of the two side arms of a three-point hitch. The device also includes a locking member secured at the rear section of the main support member. The locking member comprising a cross support member which terminates in a pair of lateral spaced ends, which have a projection extending therefrom. Each of the projections having a hole that is in axial alignment so as to receive a first locking pin therethrough. The projections have a length such that when the device is mounted on two arms of a three-point hitch, the first locking pin passes through said aligned holes in the projections so as to capture the two arms between the cross support member and pin.

Abstract: A method of removing scratches and/or abrasions from the surface of a plastic lens which comprises providing a plastic lens which has one or more surface scratches and/or abrasions, applying a wax composition which contains a pigment to the surface of the lens resulting in the formation of a coating on at least the abraded and scratched portions of said surface and removing said wax coating by wiping it from said surface, whereby said surface is rendered substantially more tolerable to the user.

Abstract: A rack and retainer for use with an existing rack for holding test tubes and similar like articles. The rack or retainer is provided with a projecting member for firmly holding in position a test tube or similar like article placed therein.

Abstract: A sensor for placement against the tissue of a living subject for the purpose of measuring a physiological quantity. The sensor includes a rigid housing having a recess chamber formed therein. A light source and sensor is mounted in a flexible mounting pad secured to the housing. The flexible mounting pad allows the light source and sensor to move independently of each other and conforms to the adjacent tissue.

Abstract: An apparatus for directing a liquid spray against the interior walls of a vessel. The apparatus includes a housing mounted to the vessel. The housing has a rotatably mounted pod disposed within an interior receiving chamber formed in the housing. A spray nozzle is mounted within a chamber formed in the pod. The pod can be rotated so as to allow communication of the nozzle with the interior of the vessel, or so as to allow access for the nozzle when it is not in use.

Abstract: An orthodontic tensioning device and method of assembly. The device comprises at least one elastic tensioning member and a second tensioning member made of a non-elastic material provided for cooperation with the elastic tensioning member so as to provide a predetermined tensioning member.

Abstract: An orthodontic bracket, a method of manufacture and method of installing the bracket. The bracket is provided with visually enhanced reference edges for assisting in alignment of the bracket with respect to the tooth.

Abstract: A tool for shaping wax and wax-like substances has a handpiece containing an electrical connector for connection to a source of electrical power and an opening in which an electrically heated tool tip is removably mounted for the convenient interchange of tips. The tool tip is held in a fixed predetermined position in the opening by ridges in the opening interlocked with complementary notches on the tip and is removably mounted within the opening in electrical connection with the connector. A cooling air gap is formed between the outer surface of said tip and the inner surface of said opening by the interlocked ridges and notches to prevent overheating of the handpiece. The tip comprises two spaced apart electrically conductive parallel wires which are connected at one end to form a continuous tip which defines a confined air gap of a defined configuration which is suitable for holding and shaping wax.

Abstract: An orthodontic bracket having a base portion for attachment to a tooth. The base portion is provided with a substantially monolayer of substantially uniform sized particles. The particles may have a size in the range of 5 to 200 micron.

Abstract: Anti-thrombobenic, anti-microbial compositions containing heparin reacted with quaternary ammonium components and bound with water-insoluble polymers are disclosed. Such compositions may also contain additional quaternary ammonium compounds not reacted with heparin and may also contain quaternary ammonium compound(s) reacted with antibiotics.

Abstract: An apparatus for incubating and/or incubating shaking biological test specimens having a detachable autoclavable chamber. The main incubating chamber is provided with a support plate and diffuser plate for directing a controlled flow of heated air to the biological test specimen. A transverse blower is provided to assist in providing uniform air flow within the main incubating chamber.