Abstract: A bifocal contact lens blank having a front surface portion which is subdivided into distant and near vision front surface segments. The distant vision segment surface is defined by a partially spherical front surface with a first radius of curvature, and the near vision segment surface is defined by a spherical segment front surface portion with a smaller radius of curvature. The distant vision segment lies in the upper part of the lens blank and the near vision segment in the lower half; the surfaces meet along a locus of tangent points lying generally centrally of the lens and joined to each other on either side of this locus by a pair of offsetting front surfaces which extend between the lowermost edges of the distant vision segment surface and the uppermost edges of the near vision segment surface. These offsetting surfaces lie generally perpendicular to at least one of the segment surfaces, substantially along a meridian of the lens front surface.

Abstract: A method of manufacturing a composite seal assembly. A primary sealing ring in generally frustoconical form is cut from a cylindrical billet of a resinous fluorocarbon material so as to have first and second principal surfaces each inclined with respect to the axis of the billet. The ring thus formed is supported against movement by disposing a relatively rigid annular casing unit adjacent the ring, with the ring lying within the casing opening, and bonding the casing element to the seal ring by molding an elastomeric collar of thin cross-section between a portion of the second surface of the ring and a part of said casing.

Abstract: A heart valve prosthesis with an annular body portion and at least one valve leaflet moveable between open, closed, and intermediate positions. The body includes leaflet ear support formations, each with a contoured recess having spaced apart, tapered arcuate guide wall surfaces and spaced apart convex ear support surfaces. Each valve leaflet includes mounting ears with upper and lower support surfaces of generally trapezoidal outline, a generally flat end face portion, and two spaced apart guide surface portions tapered so as to lie in closely spaced apart relation to the tapered guide walls in the recess.

Abstract: A fluid administration apparatus which comprises a fluid receptacle and a fluid administration conduit assembly having a hollow fluid administration tube, a handle and a hollow spike unit extending axially outwardly from said handle said handle and said fluid tube being adapted to be positioned exterior to said receptacle and said spike being adapted to be positioned within said receptacle, said spike including a shank and a tip and said receptacle comprising two fluid chamber separated by a pierceable membrane.

Abstract: A seal having a primary seal element including a casing element of annular form made a relatively rigid material and having an at least partially elastomeric sealing lip body bonded thereto, and a single or one-piece wear sleeve and unitizing casing portion including a radial flange acting as an axially exterior protective element preventing relative axial movement of the associated primary seal in one direction, an axially extending wear sleeve portion having a cylindrical outer diameter surface facing toward and sealingly engaged with the seal band portion of the primary lip, and a second, unitizing or locking flange of reduced thickness and reduced diameter with respect to the protective flange and preventing axial removal of the primary seal unit in the other axial direction.

Abstract: An orthopedic appliance, such as a crutch, adapted to support the body of an injured or handicapped person without the use of his arms and hands. The crutch is adapted to be readily movable with the person and comprises a principal frame assembly having a lower portion adapted to engage and rest upon a travelled surface in position of use, a seat assembly disposed at the other end of the frame and forming body support means for a person. The crutch has at least one handle extending radially outwardly from said frame and spaced downwardly apart from said seat assembly, and it is positioned relative to said frame so as to be able to be grasped by said person while said person is supported by said seat. Preferably the appliance also includes a foot support peg assembly near the bottom, a clip or the like for securing the ankle to the bottom of the frame and a height adjustment assembly.

Abstract: A low profile parts washer with a central solvent storage well, a pair of side walls subdivided into upper and lower portions, intermediate wall supporting wheels with the wheel axle lined above the well bottom, a safety cover positioned by a pair of supports and held above the well by fusible link means, a solvent pump and motor and a parts retainer screen covering the opening formed by the intermediate walls and the center solvent well.

Abstract: A floor structure support system comprising a main floor which directly supports one or more computers and one or more additional floors disposed beneath the main floor. The additional floor or floors provide support and mechanical isolation for cables and other electrical conductors, and include sidewalls defining vertical passages to the main floor; one or more of the additional floors may be used as environmental control ducts, with or without sidewalls in addition to those forming the vertical passages. A modular system of support columns, brackets and floor and wall panels is disclosed.

Abstract: A spray nozzle for use in an airless spray gun wherein the surface finish of the spray nozzle tip is highly polished to create a mirror-like or micro-finish, in the immediate area surrounding the exit orifice of the spray nozzle tip, such that during the use of the spray nozzle, the material sprayed therethrough will not substantially build up or collect on the spray nozzle tip in such a degree that would necessitate the removal for cleaning of the tip, thereby significantly enhancing the performance and operation of the spray nozzle in connection with its spraying operations.

Abstract: A seal having an exterior seal casing which includes a mounting surface and a seal lip body bonded to a portion of the casing, with the seal lip body comprising annular surfaces defining the air and oil side portions of a primary lip which meet along a generally cylindrical locus of measurable axial extent to provide a primary seal band with a plurality of spaced apart hydrodynamic pumping elements located on this seal band. An auxiliary lip is defined by a pair of frusto-conical surfaces meeting along a generally circular locus to provide an auxiliary or excluder lip portion. Said primary and secondary lips are spaced apart by an annular region of generally V-shaped cross-section, and the primary lip dimension or the pumping elements serve to maintain the primary lip seal band spaced just apart from an associated shaft, at least in the regions of the elements. Said auxiliary lip is of reduced diameter in relation to said seal band dimension in the relaxed condition of the seal.

Abstract: Compositions and methods for cleaning the surface of aluminum articles encrusted with cooked-on grease, oil and protein residues. The method includes immersing aluminum cookware in a solution of about 50 to about 75 parts by weight of water, about 2 to about 5 parts by weight of a strong alkali metal hydroxide, from about 1/2 to about 2 parts by weight of calcium chloride, from about 2 to about 4 parts by weight of sucrose, from about 0.05 to about 0.2 parts by weight of a non-ionic surface active agent and from about 0.2 to about 0.5 parts of an anti-foaming agent. The articles may be soaked for 12 to 24 hours without damage.

Abstract: The present invention is directed to a grit exclusion and oil retention seal for use in extremely hostile environments. These environments include, but are not limited to sealing oil within cavities forming parts of earth drilling bits and the like. Seals such as these, include the ability to seal oil within a cavity in a reliable manner even under extreme conditions of vibration, mechanical shock, and the presence of grit, sand, water, dirt and mixtures thereof. In order to function properly in this environment, the seal must also provide a certain amount of axial end play so that relative movement of the sealed parts will not permit the seal to leak.In this connection, a heavy duty seal of the type with which the invention is concerned must provide not only a primary or relatively moveable seal, but also a secondary seal. The seal assembly must include means for transmitting torque from the housing or carrier to the primary seal rings.

Abstract: A method for treating and cleaning stained concrete surface which involves applying a phosphoric acid-containing solution to said surface and drying same.

Abstract: An expansion control mixing and dispensing nozzle adapted for attachment to an associated two-component liquid dispensing gun for mixing and dispensing liquid foamable products. The nozzle includes a mixing chamber, a mixing chamber outlet tube and an outlet tube cover arranged in co-axial relation. The outlet tube cover including an outlet slot or passage in its outer end portion; its inner end surrounds a part of the mixing chamber outlet tube so as to define an annular auxiliary chamber therebetween. The mixing chamber has spaced apart inlet ports for receiving individual liquid components and a baffle or the like to impart a swirling action to the components as they expand in the mixing chamber, a pre-discharge chamber lies between the outlet slot and the end of the outlet cover.

Abstract: A multipart mold assembly for removably receiving a casing unit and positioning the casing so as to form, in combination with at least one of the mold parts, a cavity having the shape of an element to be formed in the mold and bonded to the casing. One mold part has a surface defining part of the shape of said cavity, and a casing skirt support surface forms another part of the cavity. A flash barrier is formed along a part of the skirt casing when a clamping ring formed from a plurality of individual clamping ring elements engages the surface of said casing skirt and urges it into fluid-tight relation with the casing support surface.

Abstract: An improved seal assembly which provides a seal having a unitizing element adapted to fit over one portion of a sealed mechanism and a primary seal assembly adapted to be received within or with respect to another sealed part which moves relative to the first sealed part. The seal includes a unitizing or locking flange made from a reduced thickness or skirt portion at the end of the wear sleeve on the unitizing element, such flange being axially offset from the seal contact band. The assembled seal is made from a casing unit, an elastomer which provides a mounting surface an a resiliency imparting element, together with a bonded fluoroelastomer ring which is assembled protectively with a unitizing casing which includes a wear sleeve portion having one radial flange thereof forming a protective element and the other being a unitizing flange made from an end portion of the wear sleeve.

Abstract: An oil seal unit including an elastomeric sealing lip portion and a casing portion made from a rigid material and having a mounting flange, a radially extending, offsetting flange, and an annular inner mounting bead formed by folding at least two thicknesses of the casing material upon each other so as to form first and second inclined flange portions connected to each other by a bight portion, one of the thicknesses terminating in an edge portion and with the bight portion presenting a rounded exterior surface portion directed generally toward the sealed region and the inner diameter of the seal, the sealing lip portion having air and oil side surfaces meeting each other along a circumferential locus to define a seal band, and having another portion bonded to and completely surrounding an inner margin of the radial casing flange and the exterior surfaces and edge portion of the material thicknesses forming the bead, to provide a bonded area adapted to resist failure under the application of high pressure.

Abstract: A method of treating chemical process water which contains dissolved solids, usually of a biodegradable organic nature. According to the invention, the dissolved organic solids, which are objectionable because they cause process equipment corrosion, undesirable product and process odors and pollution, are treated with ultraviolet light. The light treatment causes dissolved materials of relatively simple chemical structure to react and create more complex, less soluble materials which can easily be removed from the system as they become less soluble. The method is applicable to papermaking and numerous other industrial processes using large quantities of process water.

Abstract: A pumping seal having an elastomeric hydrodynamic primary lip and a resinous fluorocarbon auxiliary lip. The auxiliary lip is of completely or partially frusto-conical form in at least one portion so as to provide desirable venting geometry. Said auxiliary lip is bonded to a portion of the primary seal lip adjacent the area at which the primary lip is bonded to the casing of the seal. The seal provides a strong pumping action without providing the potential for drawing a measurable vacuum in the inter-lip area.