Abstract: An adaptor device for retrofitting in a filter housing is disclosed. The adaptor device allows the filter to be retrofitted with a plurality of filter elements, thereby improving its filtering efficiency.

Abstract: A portable power supply and recharging apparatus includes a housing that has a bottom wall and a peripheral wall that is attached to and extends upwardly from the bottom wall. The peripheral wall has an upper edge defining an opening into the housing. A cover is selectively coupled to the peripheral wall such that the cover closes the opening. A plurality of electrical contacts is mounted within the housing. The contacts are electrically coupled in series. A plurality of batteries is each removably positioned in the housing and each is in electrical connection with the electrical contacts. Each of a pair of female plugs adapted for receiving a male lighter plug is mounted in the peripheral wall. Each of the female plugs is electrically coupled to the electrical contacts. The male plug of electrical equipment may be selectively coupled to one of the female plugs.

Abstract: A compass is provided for marking, scoring or cutting curves on a surface. The compass includes an instrument holder adapted for receiving and holding a surface-engaging instrument. An adjustable-length cable has a proximal end secured to the holder and a free end for being anchored to the surface a selected distance from the holder. The selected distance defines a radius of a curve formed by operation of the compass.

Abstract: A compass is provided for marking, scoring or cutting curves on a surface. The compass includes an instrument holder adapted for receiving and holding a surface-engaging instrument. An adjustable-length cable has a proximal end secured to the holder and a free end for being anchored to the surface a selected distance from the holder. The selected distance defines a radius of a curve formed by operation of the compass.

Abstract: A gas turbine engine starting strategy is disclosed which minimizes thermal stress utilizing a total fuel demand based on summing two components. The first component is a prescheduled quantity of fuel near the low limit of predicted fuel requirements as a function of turbine spool rotational speed. The second component is dynamically determined based on a comparison of turbine spool rotational acceleration with stored rotational acceleration values at different turbine spool rotational speeds.

Abstract: In a fuel control system for turbine engines, it is beneficial to provide a minimum fuel signal which prevents the fuel demand of the turbine engine from being decreased below a lower limit which can cause flameout or extinction. The fuel control system of the present invention provides an electronic circuit that includes a portion which dynamically determines the minimum fuel demand of the turbine engine during operation. A circuit is provided to compare the power output of the turbine engine to a predetermined threshold magnitude. The no-load or low-load minimum fuel demand level is continually monitored until the power output of the turbine engine exceeds the predetermined threshold magnitude at which time the stored value of fuel demand is inhibited from being subsequently changed. During later operation of the turbine engine, the stored value of minimum fuel demand is provided to a most fuel bus to operate as a minimum limit of fuel demand for the turbine engine.

Abstract: Copolymerization of ethylene and a C.sub.3 -C.sub.20 alpha-monoolefin at high temperature gives a low density polyethylene having a density of between 0.91 and 0.93 g/cc. The copolymerizations are accomplished with a catalyst made by co-comminuting an anhydrous magnesium halide, an anhydrous aluminum halide, a titanium compound, and at least one electron donor, and a cocatalyst comprising a synergistic mixture of an alkyl aluminum chloride and an oxygen-containing aluminum compound having oxygen attached to at least one aluminum valence.

Abstract: Expandable styrene polymer particles which have anti-static and anti-lumping properties during expansion and after molding into an article are produced by adding 0.1 to 0.4 parts of dialkyl bisalkoxylated quaternary ammonium salts per 100 parts of polymer particles by coating of the expandable polymer particles with the salts. The salts may be added as sole antistatic agent or in addition to the known internal additives which impart fastcool and antilump properties.

Abstract: Expandable styrene polymer particles which have anti-static and anti-lumping properties during expansion and after molding into an article are produced by adding 0.1 to 0.4 parts of trialkyl alkylalkoxylated quaternary ammonium salts, per 100 parts of polymer particles by coating of the expandable polymer particles with the salts. The salts may be added as sole antistatic agent or in addition to the known internal additives which impart fast-cool and anti-lump properties.

Abstract: Expandable styrene polymer particles which have anti-static and anti-lumping properties during expansion and after molding into an article are produced by adding 0.1 to 0.4 parts of dialkyl bisalkoxylated quaternary ammonium salts per 100 parts of polymer particles by coating of the expandable polymer particles with the salts. The salts may be added as sole antistatic agent or in addition to the known internal additives which impart fastcool and antilump properties.

Abstract: Expandable styrene polymer particles which have anti-static and anti-lumping properties during expansion and after molding into an article are produced by adding 0.1 to 0.4 parts of trialkyl alkylalkoxylated quaternary ammonium salts, per 100 parts of polymer particles by coating of the expandable polymer particles with the salts. The salts may be added as sole antistatic agent or in addition to the known internal additives which impart fast-cool and anti-lump properties.

Abstract: Catalysts for the polymerization of ethylene or its copolymerization with C.sub.3 -C.sub.2 alpha-monoolefins are often pre-activated by polymerizing a small amount of C.sub.4 -C.sub.12 alpha-monoolefin onto the catalyst in the presence of an alkyl aluminum compound. The resultant pre-activated catalyst component is used in the form of a dispersion in an inert solvent. The dispersions have a tendency to separate into two phases rapidly and are thus difficult to add uniformly to a polymerization reaction. When the alkyl aluminum compound is replaced by a synergistic mixture of an alkyl aluminum choride and an oxygen-containing aluminum compound having oxygen attached to at least one aluminum valence, a stable dispersion is formed which will not separate into two phases for long periods of time.

Abstract: A process is provided for transforming a polyolefin powder into a suitable substrate for the preparation of transition metal catalysts. A powder polyolefin such as polyethylene or polypropylene is treated with a solution of a magnesium alkyl. The solvent is removed by any suitable procedure such as vacuum drying. The powder is then treated with gaseous HCl or other agent suitable for decomposition of the magnesium alkyl. The powder thus prepared is an effective support for preparing high efficiency catalysts such as taught in U.S. Pat. No. 4,136,058. These catalysts give polymers of increased particle size. Polyolefin powder in the absence of such treatment is not effective as a catalyst support and will not give polymers of increased particle size.

Abstract: Articles of glass are coated with copolymers of ethylene and 2-norbornenes or terpolymers of ethylene, 2-norbornenes and 1-butene. The coating serves to reduce shatter of the glass and its scatter on breaking. Resin-coated bottles are especially useful for bottling carbonated beverages to prevent flying glass if the bottle is dropped or explodes.

Abstract: Olefin polymerization catalysts prepared by reducing transition metal compounds with an organometallic compound are rendered highly efficient by reacting excess organometallic compound with a deactivation agent, such as hydrogen chloride, prior to activation of the catalyst with organoaluminum compounds. Catalyst efficiencies of as high as 700,000 grams of polyethylene per gram of transition metal in the catalyst have been attained at reactor pressures of only 50 psig.

Abstract: A unique high efficiency catalyst has been developed for the polymerization of ethylene. The activity of the catalyst, which uses a mixed magnesium-aluminum alkyl as a reducing agent for tetrabutyltitanate, and hydrogen chloride to deactivate excess reducing agent, is dependent on a specific and unpredicted order of addition of catalyst components.