A strip of sheet material is embossed with ribs of the character of screw threads on both of its faces and then the strip is rolled to form a longitudinally split tubular insert for use to retain a screw member in a threaded bore of a workpiece. Self-locking action may be accomplished in various ways as follows: the insert may be non-circular for binding action on the walls of the bore; one of the two confronting ends of the tubular insert may be offset inwardly to resist relative rotation betwe...

A filter for removing impurities from fluids. The filter housing is generally rectangular in cross-section, or, more generally is of prismatic shape, facilitating combination with flat end surfaces of cabinets, appliances and devices cooperating with the filter.

An airfoil and method for its forming, the airfoil having a foreign object damage and erosion resistant outer skin or shell and an inner body composed of resin-impregnated fiber with high fiber to resin content, the resin being cured during the application of the skin to the inner body to provide an integrally bonded unit.

Forwardly extending butt portions of barbs of a tail feather from a Chinese pheasant are bound by a thread to the rear portion of a shank of a hook and are closely wound forwardly on the shank to form a nymph body. The barbs are bound to the shank slightly ahead of the closely wound body and the free end portions are folded back and the thread is wound thereover to hold them in downwardly and rearwardly extending positions to form legs. Then, for a smaller fly, the thread is wound into a head, o...

A process for the production of smokeless carbon-containing briquettes is disclosed wherein particulate carbonaceous material is mixed with an aqueous suspension of copolymers of butadiene-acrylonitrile. The resulting mixture is compressed so as to form high strength smokeless briquettes.

A fuse comprising a fusible element mounted in a housing and carrying a plurality of relatively closely spaced activator cores. A method of making the fuse comprises the steps of punching discs from a strip of activator material, applying these discs to the fusible element in the desired spaced apart relationship, heating the fusible element carrying the discs so as to melt these discs to form the activator cores, and mounting this fusible element in the housing. An alternative method of making ...

1. A new article of manufacture, a propellant comprising about 21.0 percent nitrocellulose, about 13.0 percent nitroglycerine, about 55.4 percent potassium perchlorate of an average particle diameter of 7.5 .+-. 0.5 mu, about 9.0 percent carbon black, about 1.0 percent centralite No. 1, 0.3 percent magnesium oxide and 0.3 percent magnesium stearate, the nitrocellulose and nitroglycerine being colloided and intimately mixed with the other ingredients to form a matrix in which the particles of pot...

An article such as a collar having a setscrew for enabling securing the collar on a shaft member which is telescopically received in an opening of the collar characterized by the collar having a pair of cavities with one cavity in communication with the opening and extending from one end and the other cavity extending from the opposite end and in communication with an outer surface of the collar. Each of the cavities terminates in a partial annular threaded segment which segment coacts to form a...

A double seat valve having a valve body formed of conductive metal with a relatively thin-wall top portion forming the side wall of an open ended cavity, and a bottom portion having a chamber therein communicating with the cavity. The bottom portion has first and second axially displaced ports communicating with the chamber, and a first valve seat in the chamber between the first and second ports. A valve top member has a portion extending into the cavity, that portion having a bottom enc closin...

Novel 6-thio-substituted pteridine and related compounds of the pteridine family described by the following formula have been produced directly from reaction of substituted 5-nitrosopyrimidines and pyridinium salts in the presence of a thiol. The novel 6-thio substituted compounds of the pteridine family may be represented by the general formula ##SPC1## Where R.sup.2, R.sup.4 and R.sup.6 are amino, alkyl amino, arylamino, acetamido, hydroxy alkoxy, aryloxy, thio, alkylthio, arylthio, alkyl, ary...