Abstract: Dimensionally stable, cured phenolic foams are described that have a thermal conductivity after 10-days below 0.0185 watts/m .degree.C., a density of 30 to 70 kg/cubic meter and a closed-cell content of at least 85%.

Abstract: Phenolic foams having a cell structure that is resistant to rupture under pressure and a slow deterioration of thermal insulation value are claimed. These foams can be cured to achieve dimensional stability without substantial adverse affect on their structure.

Abstract: An electrical braking circuit provides smooth transitioning between regenerative and plug braking of a DC electric motor by use of a low ohmic value resistance path to maintain motor torque during transitioning. During initiation of electrical braking, a similar low ohmic resistance path momentarily connects the motor to a power source in order to establish proper magnetic flux in the motor to enable regenerative braking. Both resistance paths are disabled during motoring and braking modes of operation in order to minimize power loss in the resistance paths.

Abstract: An awning assembly including an elongated storage case mounted on the side of a recreational vehicle, and having an extended position for providing shade and a retracted position for storage. A lead bar is connected to the outer edge of the awning, and the inner edge is connected to a spring-loaded take-up roller in the case. To brace and support the lead bar when the awning is unrolled and extended, automatically positioned, telescoping rafters extend between the ends of the case and the central portion of the lead bar, and telescoping legs pivoted on the ends of the lead bar are connectible to anchor brackets on the side of the vehicle. These legs are jointed between their ends to facilitate operation on a curved-sided vehicle, and are connected to the lead bar by swivels permitting compact folding into inconspicuous storage positions along the bottom of the case, where they are latched and partially concealed by a leg latch.

Abstract: Collector plates for use in the second stage of a two-stage electrostatic ecipitator comprise plates having non-conducting surfaces to which a coating of low conductivity, typically between 300 and 150,000 ohms per square, is affixed. One embodiment of such plates typically comprises a rigid, non-conducting plastic material coated with a material of low conductivity. Another embodiment of the present invention comprises a metallic plate coated with an insulating material of high dielectric strength, typically with a dielectric constant of at least 3000, to which the above mentioned low-conductivity coating is affixed. The collector plates may be mounted in such a manner as to maintain the airflow through the second stage of the precipitator in a direction virtually parallel to the surface of the plates.

Abstract: Beta Glass fibers are dispersed in a solution containing hydrochloric acid nd a hydrophobic fumed silicon dioxide treated with a silane thereby forming a slurry which is subjected to a sonic probe whereafter other glass fibers are mixed into said slurry and the mixture is formed into a glass fiber filter.

Abstract: A method and apparatus for sensing plugging of a DC electric motor comprising logic circuitry responsive to a direction change command for initiating a plugging signal and additional logic circuitry for maintaining said plugging signal as a function of the percentage on time of a variable time ratio switch supplying power to the motor. Inhibit circuitry is provided to override the plugging signal under operator selected conditions.