Abstract: This process for making antistatic filaments utilizes a specific mixture of compounds in order to suffuse electrically conductive particles into a filamentary polymeric substrate by forwarding the substrate through a grooved roll-type mix applicator. The mixture comprises a dispersion of the electrically conductive particles in liquid solvent which is a mixture of formic acid and a member selected from the group consisting of an amide, a carboxylic acid other than formic acid, an alcohol, an ester, a ketone, an ether, and a hydrocarbon. The process provides advantages over the prior art in permitting the use of high processing speeds, enabling easy stringup, and allowing the use of knotty and/or slubby filamentary substrates.

Abstract: A check valve of the type in which a pair of valve members are hingedly mounted to a transverse pin for pivoting movement between respective open positions and complementary closed positions in which the valve members together engage a valve seat. Torsional spring means are provided to bias the valve members to their closed positions. This means comprises a single length of wire formed into three windings which extend transversely within said passageway, two of which windings separately apply a biasing force to the respective valve members while the third, being between the other two, is wound on an axis offset from the axes of the other two, the arrangement being such as to substantially prevent dissipation of stored compressive energy from either of the respective co-axial windings to the other. Also disclosed is a bearing arrangement for valve pins which are of a material harder than the valve body.

Abstract: The invention is an integral, electrically-conductive textile filament comprising from 2 to about 1000 electrically-conducting, longitudinally-directed strata of fiber-forming polymeric material, and one non-conducting stratum of the same polymeric material in coextensive union with each electrically-conducting stratum along the length of at least one of its major surfaces. Each electrically-conducting stratum of polymeric material has dispersed therein finely-divided particles of electrically-conductive carbon black. The electrical resistance of the integral filament is not more than about 10.sup.9 ohms/cm.