Abstract: A coupling is set forth for joining a beaded end and a plain end glass pipe together, wherein an outer clamping band retains an elastomeric sleeve therewithin and inhibits the longitudinal flow thereof by means of openings and projections formed in the outer periphery of the band, and said elastomeric sleeve is provided with varying diameters and recesses for providing unequal force distribution across the coupling while limiting the longitudinal expansion of the elastomeric sleeve.

Abstract: A coupling between first and second tubular members comprising a flexible retaining ring fitted over the first tubular member below an annular enlargement thereof and entering into screw-threaded engagement with internal screw-threading on the second tubular member or a connector element attached thereto. The retaining ring is a split-ring member whose longitudinally extending slit enables it to be passed lengthwise over the first tubular member and is so dimensioned that on re-assuming its original form, the opposed margins of the slit abut and the retaining ring is held against the first tubular member against removal therefrom by the enlargement, and the second tubular member or connecting member is coupled to the first tubular member. A sealing member is positioned at the coupling to form a fluid-tight seal at the junction of the tubular members.

Abstract: An insulating pipe joint is disclosed. The joint comprises a first tubular member, a second tubular member comprising a cylinder having the same inside diameter as that of the first tubular member and an annular metal stopper at one end of said cylinder, and an insulator made of a glass/mica composition and a cured organic, solventless resin. The annular metal stopper has an inside diameter larger than the outside diameter of the first tubular member, and the annular metal stopper nests the first tubular member with a space left between them. The insulator fills the space to hold the first and second tubular members in position and provide air- and water-tightness, and secures the insulation creeping distance between each tubular member.

Abstract: A coupler for electrically-isolating two conductive sections of fluid-passing line includes two nonconductively-interconnected pieces of tubing for insertion in the line. The pieces of tubing each have a divergently-flared end, and the flared ends are nonconductively-interconnected within two dielectric wafers. Each wafer has a tapered hole extending through it that matches the flared ends and enlarges to a face on the wafer. The flared ends are each bonded within a separate one of the tapered holes in a position recessed from the face with the flare of the end paralleling the taper of the hole, and the faces are bonded together with the larger ends of the tapered holes aligned and the flared ends sealed in fluid communication with an electrically-nonconductive gap between them.