Abstract: Improved devices, circuits and methods of operation in implantable stimulus systems. An implantable defibrillator may comprise an H-bridge output circuit having low and high sides, with a current controlling circuit coupled to the high side of the H-bridge output circuit and a current monitoring circuit coupled to the low side of the H-bridge output circuit. Alternate current paths to the output of the H-bridge, or to the H-Bridge itself, are used for delivering different therapies to the patient.

Abstract: A streamlined, self-cleaning, non-driven pulley having a center flange extending radially from a center hub which has axially extending radial ribs on either side of the flange. The space between adjacent ribs is filled by a web sloping radially inward toward the axis of rotation of the pulley and axially outward from the center flange. In operation with a belt having two parallel longitudinal rows of internal driving lugs, the pulley flange contacts the belt between the lug rows to support the belt. Each belt lug is supported by the ribs as it passes over the pulley to maximize the width of support to the belt tensile member while under working load.

Abstract: This invention provides a method of controlling the pollution in a microwave devulcanization process consisting of passing particles of sulfur-vulcanized elastomer containing polar groups through a microwave energy devulcanization device to generate heat in the devulcanization of said particles whereby said particles exits said device at a temperature in excess of 260.degree. C., feeding said particles from the devulcanization device to feed input of an extruder, extruding said particles to exit the extruder at a temperature of about 90.degree. to 125.degree. C. as an extrudate. The extrudate can be used per se as a compounding stock or sent to a mill to be sheeted and stored until needed.

Abstract: An improved curable chopped fiber loaded elastomer or plastic composition composed of a blend of about 5 to 50 percent of chopped fiber of up to 1.3 centimeters in length and 95 to 50 percent of particulate unvulcanized elastomer or plastic which is capable of passing a 6 mesh U.S. Standard Screen.

Abstract: An improved processable silicone rubber composition composed of a blend of 1 to 10 percent by weight of vulcanized particulate silicone rubber and 99 to 90 percent by weight of unvulcanized or virgin silicone rubber that can be tubed at a faster rate and lower temperature to minimize structure formation.