Abstract: Improved rosin ester compositions are provided having diminished tendency toward hazing concomitant with good viscosity stability when employed in adhesive systems such as hot melt adhesive systems. Addition of zinc composition to rosin ester formulations in an effective amount serves to secure these improvements. Zinc oxide, zinc hydroxide and zinc salts of organic acids are suitable for employment with zinc resinates being preferred in accordance with the practice of certain embodiments.

Abstract: A switched cavity laser system which includes a resonant cavity, a gain medium within the resonant cavity, a cavity switch and an output coupler. A controllable pump energy source delivers pump energy to the gain medium in response to an energy control signal. A detector is coupled with the gain medium and generates a detector signal in response to the amount of population inversion exhibited by the gain medium. A control circuit is coupled to the detector and controllable pump energy source for generating the energy control signal in response to the detector signal. As the switching rate of the Q-switch is varied, the energy control signal varies to ensure a constant level of population inversion between each pulse. In this matter, a prespecified pulse energy is achieved for each pulse independent of the switching rate of the Q-switch.

Abstract: An uninterrupted power supply (UPS) system is provided with a power factor correction circuit. The UPS system includes a rectifier having input terminals for connection to an AC utility power source and output terminals. The power factor correction circuit is operatively connected to the input and output terminals of the rectifier to cause the UPS system to exhibit substantially unity power factor to the AC utility power source.

Abstract: A method of improving the color of tall oil rosin esters comprising the sequential steps of (a) recrystallizing a tall oil rosin from a solvent, (b) purifying the crystalline portion by distillation, and (c) esterifying the resultant rosin with a polyol.

Abstract: A non-conductive substrate is conditioned for subsequent selective deposition of a metal thereon by providing at least one of the major surfaces of the substrate in roughened form, contacting that surface(s) with a palladium/tin catalyst, activating the catalyst by employing an alkali hydroxide solution, laminating a photosensitive composition to the major surface(s), and exposing the photosensitive composition to actinic light in a predetermined pattern and then developing to provide the predetermined pattern.

Abstract: An uninterrupted power supply (UPS) systems is provided comprising a rectifier circuit, an inverter circuit and a battery boost circuit. One of the input terminals of the rectifier circuit is for connection to the ungrounded conductor of an AC power source and the other input terminal of the rectifier circuit is for connection to the grounded conductor of the AC power source. The UPS has a pair of load terminals for connection to a load. The input terminal of the rectifier circuit for connection to the grounded conductor is connected to one of the pair of load terminals by an electrical conductor whose electrical continuity is maintained from this input terminal to the one of the pair of load terminals without any isolation device such as a 50 or 60 Hz transformer being disposed between the input terminal and the one of the pair of load terminals.

Abstract: An insertable drawer member configured and dimensioned for receiving and storing digitally coded discs within an outer housing in a manner which ensures that information bearing areas of said discs are not damaged during insertion or removal therefrom, the insertable drawer member comprising: a base at least partially defined by a pair of opposed side walls, having upon its surface a semicircular groove configured for the insertion of a portion of the digitally coded disc by pressure contact, wherein only a non-information-bearing surface portion of the disc is ever contacted by the drawer member. The drawer member further comprises a lid integrally formed with the base and provided upon at least a portion of a front face thereof with a serrated gripping area to facilitate grasping and moving the drawer member to access the disc. A lower edge of the lid is configured for contact relation with an abutting V-shaped upper edge portion of the outer housing.

Abstract: An insertable drawer member configured and diimensioned for receiving and storing digitally coded discs within an outer housing in a manner which ensures that information bearing areas of said discs are not damaged during insertion or removal therefrom, the insertable drawer member comprising: a base at least partially defined by a pair of opposed side walls, having upon its surface a semicircular groove configured for the insertion of a portion of the digitally coded disc by pressure contact, wherein only a non-information-bearing surface portion of the disc is ever contacted by the drawer member. The drawer member further comprises a lid integrally formed with the base and provided upon at least a portion of a front face thereof with a serrated gripping area to facilitate grasping and moving the drawer member to access the disc. A lower edge of the lid is configured for contact relation with an abutting V-shaped upper edge portion of the outer housing.

Abstract: A screw-type fluid pump is provided with an elongate casing having a surface defining an internal fluid flow space and a screw within the flow path, fixed to the casing, and having a plurality of flights for continuously conveying fluid from an inlet on the casing to an outlet for appropriate disposition as the screw and casing are rotated. A conduit/torque tube extends through the screw in axially overlapping relationship with the casing over no more than one third the axial extent of the screw at the upper region of the casing. The conduit/torque tube establishes communication between a plurality of pockets between screw turns and the atmosphere to effect pressure equalization so that cavitation in the fluid flow space is prevented as the screw is operated. The conduit/torque tube also transmits the force from a rotary drive to the screw.

Abstract: Alkali metal and alkaline earth metal salts of hypophosphorous and phosphorous acid are used to catalyze the esterification of rosin with a polyol. The method is an improvement in that reaction time is shortened and the ester product exhibits improved color and thermal stability.

Abstract: An insertable drawer member configured and dimensioned for receiving and storing digitally coded discs within an outer housing in a manner which ensures that information bearing areas of said discs are not damaged during insertion or removal therefrom, the insertable drawer member comprising: a base at least partially defined by a pair of opposed side walls, having upon its surface a semicircular groove configured for the insertion of a portion of the digitally coded disc by pressure contact, wherein only a non-information-bearing surface portion of the disc is ever contacted by the drawer member. The drawer member further comprises a lid integrally formed with the base and provided upon at least a portion of a front face thereof with a serrated gripping area to facilitate grasping and moving the drawer member to access the disc. A lower edge of the lid is configured for contact relation with an abutting V-shaped upper edge portion of the outer housing.

Abstract: A method of preparing polyol esters of rosin comprises carrying out the esterification in an equivalent excess proportion of the rosin reactant. The product of the esterification has novel characteristics including a higher content of fully esterified polyol reactant.

Abstract: A toy is disclosed having a spring-loaded inner vehicle or projectile therewithin. An outer shell surrounds the inner vehicle, and the outer shell has a base at one end thereof constituting the rear of the shell. A spring is interposed between the inner vehicle and the base for resiliently biasing the inner vehicle away from the base in a forward direction. The outer shell has a portion thereof movable with respect to the base between a closed position in which the outer shell at least in part encloses the inner vehicle and holds the inner vehicle fixed with respect to the base while maintaining the spring in its compressed state, and an open position in which the shell portion is clear of the inner vehicle such that the spring may propel the inner vehicle forwardly with respect to the base portion.

Abstract: Organic esters of hypophosphorous acid are used to catalyze the esterification of rosin with a polyol. The method is an improvement in that reaction time is shortened and the ester product exhibits improved heat stability.

Abstract: Phosphorous acid is used to catalyze the esterification of rosin with a polyol. The method is an improvement in that reaction time is shortened and the ester product exhibits improved color and oxygen stability.

Abstract: An uninterruptible power supply including a transformer having a first input winding normally coupling an inverter AC source with a critical AC load, which transformer also includes a second input winding operable to supply power from a bypass source to the load in the event of malfunction of the inverter circuit. The inverter is of the four-quadrant pulse-width-modulated type, thereby to permit recharging of the battery which serves as the DC source to the inverter. An inductance is provided for varying the phase relationship between a utility voltage source and the inverter voltage to produce minimum real inverter current and the "break-even" operating conduction, and a step-up device is provided for increasing the utility voltage to further minimize the break-even inverter current required during normal operation, and to maximize the through-put efficiency.

Abstract: Tall oil rosin esters of pentaerythritol prepared in the presence of activated carbon possess an improved, lighter color.

Abstract: A cutting tool with precisely adjustable disposable cutting inserts. In the preferred embodiment of a face milling cutter, the tool utilizes insert holding cartridges mounted in cavities spaced about the periphery of the cutter body, each cartridge including an insert mounting pocket for presenting each insert such that its cutting portion extends beyond a face of the cutter body. The insert mounting portion of each cartridge is rendered flexible by a slot in the cartridge body. A wedge mechanism adjacent each cartridge causes the cartridge to bend in a manner such that the insert cutting tip will traverse an arcuate path thereby finally and precisely varying the extent to which the cutting portion of the insert extends beyond the cutter body face.

Abstract: This amplifier circuit for a magnetic transducer such as a magnetic head includes a pair of transistors which function both as write current modulators and read signal preamplifiers. The transistors are suitable for in situ deposition on a magnetic transducer carrier adjacent the winding, which keeps the signal lines of the data read by the transducer very short until amplification.

Abstract: There is provided a marker buoy useful to indicate the location of an underwater structure. The buoy is made from a material having a density less than water, including first and second elongated side members and a central portion therebetween. The central portion receives an elongated twine having a weight attached to its far end. Each side member has a stud extending away therefrom at opposing ends of the buoy. The buoy automatically rotates to dispense the twine when the buoy is placed on the surface of water, and is adapted to be manually rotated by manipulation of the studs to retract the twine.