A composition for preventing formation of slime which comprises a chlorine-based oxidizing agent, a sulfamic acid compound, one of an anionic polymer or a phosphonic acid compound and a process for preventing formation of slime which comprises adding the composition to a water system are disclosed. Troubles caused by slime in cooling water systems, heat-storage water systems, water systems in manufacturing processes of paper and pulp, water systems for collecting dusts and scrubber water systems...

A looper is brought into an advance state at the end of sewing, and a looper thread hanging hook arranged on the right rear side of a needle drop position is forced to advance and retreat to catch a looper thread running to the rear side of the looper and hold it on the rear side of the needle drop position. After performing sewing for one stitch in this state, the thread cutting hook arranged on the right side of the needle drop position is forced to advance and retreat to catch the looper thre...

A backflow preventing valve has a body with two principal portions made of a glass-fiber reinforced plastic. One portion has an inlet port and an outlet port on a through axis, the ports opening to an inlet chamber and an outlet chamber respectively. An intermediate chamber merges with the inlet chamber at an inlet valve seat and also merges with the outlet chamber at an outlet valve seat, the valve axes and the through axis being coplanar. Inlet and outlet poppet valves are urged toward their r...

A closure including a rigid thermoplastic member with a horizontally extending first portion occupying a major portion of the cross-sectional area within the loading aperture which is surrounded by the loading member of the hopper car, a second portion extending upwardly from the first portion which is inwardly adjacent of the interior of the loading member and a third portion extending outwardly from the second portion and overlaying the top of the loading member and underlaying the hatch cover...

A tire-slip preventing device or "chain" for a vehicle tire comprise a ladder-like arrangement of cross belts attached to two parallel cords. The belts and cords are made from an easily deformable material so that the device may be wrapped around a tire. Rotatable discs are mounted at each end of each cross belt between the cross belts and the side walls of the tire to reduce wear on the side walls as the belts move relative thereto. The cross belts may be permanently attached to both parallel c...

This hands-free telephone prevents acoustic feedback between its speaker and microphone by attenuating either the transmission or receive path under the control of a corresponding pair of counters (computers), each counter sensing the signal divided and digitized from its corresponding path. An increase in counted pulses indicates feedback and causes a counter to more quickly reach a predetermined counter state (count), to trigger attenuation (damping) before it can be reset (restored) to zero b...

Compositions for the prevention of pyorrhea alveolaris containing a fructan-degrading enzyme at a ratio ranging from 1 to 300 activity units per g. or ml. of the composition.

Disclosed is an assembly including a dump tank disposed near the fill pipe for an underground gasoline storage tank at an automobile service station. The tank is normally isolated by a hand valve and a check valve from communication with the storage tank fill pipe, however, when the storage tank has been filled from a transport vehicle, the gasoline in the fill pipe and the flexible delivery hose may be dumped into the dump tank by opening a manually operated valve. The check valve permits gasol...

The prevention of fading of denim fabric by treating the fabric with a compound or mixture of compounds having the formula ##STR1## wherein R is a linear unbranched saturated or unsaturated chain having from 7 to 17 carbon atoms, R' is either ethyl or methyl, X.sup.- is an anion selected from the group consisting of chloride, bromide methosulfate and ethosulfate, and n is an integer of from 1 to 6, and wherein at least 75 percent of the weight of the composition comprises a compound or mixture o...

A vehicle collision preventing apparatus determines the danger by an output of a radar for detecting the distance to an obstacle and the relative velocity in a danger determining circuit wherein the distance to the obstacle and the relative velocity at the present are estimated from the data given before disappearing the data of the radar by an estimate arithmetic circuit when a signal reflecting from the obstacle reduces to be incapable of detecting the obstacle by the radar.