Abstract: A filter assembly having a filter chamber. Filter means is disposed in the filter chamber which comprises at least one disc shaped filter assembly. The disc assembly has an upper support disc and a lower aligning support disc. A filter membrane is disposed on the top side of the support disc which has a plurality of primary grooves for receiving a liquid filter through the filter membrane. The aligning support disc fits substantially centrally on the bottom surface of the support disc and is provided with radially extending ribs which form radially extending grooves between. A second filter membrane is placed on the bottom surface of the support disc and overlaps a portion of the aligning disc. The bottom surface of the support disc is also provided with grooves for collection of a filtrate. Axial extending grooves are provided in the support disc for connecting the collection on the top surface with the bottom surface.

Abstract: A process for controlling algal growth in wastewater, lagoons and ponds which comprises treating the algae containing water with a high concentration of a selected actively growing species of pseudomonas product which products an exudate which exhibits antialgal characteristics.

Abstract: An electrical capacitor which contains a dielectric fluid, said fluid consisting essentially of ditolylmethane.

Abstract: A control device for use with an electrical appliance. The device comprises a handpiece having at least one exhaust port which is connected to positive fluid pressure source. Blocking of the exhaust port will operate an appropriate switch means for controlling the electrical appliance.

Abstract: An orthodontic arch wire for use in imparting corrective forces to teeth comprising:an elongated central core made of a transparent or translucent material having a modulus of at least 3,000,000 pounds per square inch;an outer layer made of a substantially transparent or translucent material which is hydrolytically stable so as to resist staining or deterioration when placed in an oral cavity.

Abstract: A pressure filter assembly having a bleed valve assembly for releasing trapped gas from with the filter chamber in a controlled manner. The bleed valve assembly includes a stem secured to the filter assembly having a bore therethrough for communication with the filter chamber and a cap for controlling the release of trapped gas within the filter chamber. The cap has a plunger with a contact surface which mates with a portion of the inside surface of the stem bore and an extension which fits with a narrow portion of the bore.

Abstract: A plastic bottle closure assembly comprising a plastic bottle having a threaded neck portion, a closure for engagement with the neck portion and a sealing plug. The sealing plug has an annular mating surface designed to engage an annular planer mating surface of the neck portion. The closure is provided with annular rib for engaging the plug so as to cause the inner mating surface of the plug to engage the mating section of neck portion of the bottle.

Abstract: A system for treating soil contaminated by petroleum hydrocarbons which comprises applying a suitable bacterial culture capable of degrading petroleum hydrocarbons in a dry form to the bottom of an excavated cavity, applying gravel to a suitable depth over said dry cultures, providing a system of distribution piping capable of supplying nutrients directly to said cultures, and also an air flow through the area containing said cultures, and placing the appropriate tank in place within said cavity and covering with gravel and dirt.The system is activated by providing said cultures with a source of nutrients through said piping followed by flowing air through the piping to facilitate metabolization of the hydrocarbons contained in the soil.

Abstract: A plastic filterware having a filter membrane made at least in part of cellulose nitrate welded to the filterware and a method of making same.

Abstract: An orthodontic bracket and method of making same wherein the bracket has at least one tiewing integrally formed with a base portion. In one form of the invention the bracket is provided with at least one longitudinally extending groove which extends into the base portion, the groove having at least a portion extending beyond at least a portion of the groove opening. In another aspect of the present invention is directed to a method of making an orthodontic bracket using ultrasonic machining techniques.

Abstract: A container for thin glass plates having a base portion. The base portion is provided with a well having a substantially planar bottom surface at an angle with respect to the vertical plane of the glass slides.

Abstract: A container for initially holding a plurality of individual packages and later holding a plurality of slides in a spaced apart relationship. The container comprises a base portion having a receiving well and a top cover for mating with the base portion. The receiving well is designed so as to hold at least one box initially and later to hold a plurality of microscope slides placed therein.

Abstract: The present invention provides a high output radiant heater which uses a heat exchanger to obtain a variety of types of heat from a single power source.

Abstract: An improved bookmarker for maintaining the place of a reader in a book having a spring retaining marking arm. A u-shaped clip has upwardly extending front and back sections and a bottom section having an axial slot on one edge and an opening spaced from the slot. The marking arm has a hook portion and a loop portion for engaging the opening and slot, respectively, of the bottom section fixedly securing the marking arm to the clip.

Abstract: A device suitable for seeding bacterial cultures to waste flowing through or which has accumulated in a collection system which comprises a porous outer covering member which forms an enclosed package with a source of bacterial cultures contained within said package, said cultures suitable for seeding a collection system as a waste stream flows through the porous covering member of said enclosed package causing the bacteria to be released into said waste stream.

Abstract: The specification describes an apparatus which includes a mold cavity for use in molding an article such as a bar of soap. The mold cavity, which includes a bottom wall, side walls and end walls, is provided with means for moving at least one of the walls after the article has been formed in the mold so as to permit easy removal of the article therefrom.

Abstract: A polyvinylsiloxane catalyst paste which comprises up to 20,000 ppm of finely divided platinum black which functions to adsorb hydrogen gas generated in the reaction of said catalyst paste with a hydrofunctional polydimethylsiloxane.

Abstract: An apparatus for cleaning a closed vessel having a retraction mechanism for extending or retracting a spray mechanism within the vessel. The apparatus includes a housing and door assembly for separating the spraying mechanism from the interior to the vessel when not in use.

Abstract: Gas testing apparatus comprises a gas chamber wherein a test body surrounded by a single turn electrical conductor is suspended by a metal strip in a non-uniform and non-symmetrical magnetic field which is formulated by especially shaped pole pieces which could, in one form, by permanent magnets. The test body is deflected from the initial position it takes when a reference gas is in the cell, by the admittance of a gas mixture of which is paramagnetic gas is one constituent. The deflection is sensed by an optical system comprising a light source, a mirror on the test body and a pair of photocells. The output of the photocells feeds an amplifier system, which in turn feeds the single turn coil by a current of an adequate value such that it stops the test body from moving from its initial position and hence is proportional to the partial pressure of the paramagnetic gas in the sample.

Abstract: A toy in the form of a tracked vehicle containing a pair of tracks which turn in a manner which simulates a full-sized tracked vehicle, the vehicle having a supporting frame, a tricycle device mounted on the frame, the tricycle device having a pedal actuated drive wheel mounted at the forward end of the frame and a pair of auxiliary wheels in parallel relationship to each other mounted at the opposite end of the frame, a steering device connected to the drive wheel for turning the tricycle device in any direction thereby controlling the direction of the tracked vehicle, and idler devices mounted on the frame associated with each auxiliary wheel and positioned forward of the auxiliary wheels, each of the tracks being affixed respectively to one of the auxiliary wheels and the associated idler devices to allow for track movement in response to movement of the auxiliary wheels, the idler devices being positioned to maintain the tracks out of contact with the riding surface of the vehicle at the forward end of th