Abstract:
A resilient static and dynamic sealing assembly for maintaining a fluid tight joint or connection between operatively associated elements where the elements are made of materials having different coefficients of expansion and one element of a relatively stronger material acts to confine the other material in the operative position. The sealing assembly includes on the confined element an elastomeric means which coacts with an annular wall in engagement with the confining element and acts with the annular wall to maintain the seal within conventionally anticipated temperature ranges at least between 32*F and 212*F. The sealing assembly can be provided with means for adjusting the force exerted to form the seal between the operatively associated elements. Further, the sealing assembly will provide an improved laboratory Burette, disposable hypodermic syringes and other devices adapted to utilize the same.
Abstract:
Tubing having a smooth inner bore and a smooth even outer surface wherein the properties of X-ray opacity and optical permeability are optimized and maximized by forming the tubing from a plastic and an X-ray opaque substance homogeneously dispersed in the plastic wherein the X-ray opaque substance has a controlled concentration and an index of refraction as close to the index of refraction of the plastic as possible; additionally where the plastic forms crystalline structures it is not annealed during the fabrication of the tubing to further optimize optical permeability of the tubing.
Abstract:
A plastic, material, article or object formed as a substantial duplicate in high molecular weight polymeric material such as polyfluorocarbon resins, polyvinyl chloride and polyvinyidene chloride; of a matrix consisting of cellulosic and proteinacious materials by the process of impregnating a selected matrex with the selected high molecular weight polymeric material and carbonizing the matrix in a controlled concentration of oxygen at a temperature at least equal to the sintering temperature of the selected high molecular weight polymeric duplicating material until the duplicating material coalesces to form the selfsupporting continuous duplicate by gradual replacement of the carbonizing fibers of the selected matrix.
Abstract:
A resilient static and dynamic sealing assembly for maintaining a fluidtight joint or connection between operatively associated elements where the elements are made of materials having different coefficients of expansion and one element of a relatively stronger material acts to confine the other material in the operative position. The sealing assembly includes on the confined element an elastomeric means which coacts with an annular wall in engagement with the confining element and acts with the annular wall to maintain the seal within conventionally anticipated temperature ranges at least between 32* and 212* F. The sealing assembly can be provided with means for adjusting the force exerted to form the seal between the operatively associated elements. Further, the sealing assembly will provide an improved laboratory Burette, disposable hypodermic syringes and other devices adapted to utilize the same.