Abstract: A transportation and launching device for boats which can be handled by one person and which is carried with the boat during overland transportation, launching, and water operation of the boat. The device remains completely external to the boat during operation and storage and may be equipped for manual or automatic adjustment of the wheel axles to the longitudinal center of gravity of the boat to accommodate loading changes affecting the center of gravity. The device is typically used with the boat in an upright position but may be adjusted to move the boat in an inverted position as an aid in maintenance. The device is removable for compact storage and may be adjusted to fit on boats of various sizes.

Abstract: In one embodiment, the anti-pinch device includes a vertical support mounted normal to the saw blade of the chain saw. A pinch arm extends longitudinally above the saw blade and is mounted for translational movement along the length of the vertical support. The pinch arm is attached to a transversely movable mount by a pivot such that the pinch arm can pivotally move with respect to the vertical support and the mount and pinch arm can transversely move up and down the vertical support in a substantially free manner.

Abstract: A teleradiology system capable of scanning X-ray images and the like and transmitting the scanned images to various locations is disclosed. The images may be compressed for storage or transmission. Compressed images can be transmitted much more quickly and take up much less space than uncompressed images. Compressed images can be expanded for, among other things, viewing. The compressor/expander and input/output devices reside on a bus structure in such a manner that digital image data can be selectively passed between the compressor/expander and the various input/output devices.

Abstract: An impulse activated switch having a controlled time-delayed self-restoration from its complementary state to its initial state is described. Upon illumination, a photodiode array connected to the gate and source electrodes of a field effect transistor produces a voltage which changes the current conduction state of the field effect transistor to its complementary state and charges a capacitance. The capacitance forms part of an RC timing network which controls the time required for self-restoration. The switch may be normally on or off and unilateral or bilateral.

Abstract: An all solid-state protector circuit utilizes the combination of four zener diodes (Z1, Z2, Z3, Z4), two resistors (R1, R2), two capacitors (C1, C2), and two gated diode type switches (GDSA, GDSB) and provides bilateral voltage surge protection.

Abstract: A circuit with low impedance for maintaining a single polarity at an output is disclosed. Switching is provided by light controlled switching devices which in one embodiment are field effect transistors (14, 15, 16, 17) which are optically triggered by one or more photo-responsive devices (26', 27', 28', 29') coupled to their gate electrodes. The ON-OFF state of each switch is determined by the presence or absence of light from an adjacent line-powered LED (26, 27, 28, 29). A diode (32, 33, 34, 35) may be included in parallel with each switching device to provide surge protection.

Abstract: An optically toggled bilateral field effect transistor switch having a low leakage current is described. A high impedance path and, therefore, a low leakage current, is provided by a photovoltaically controlled field effect transistor.

Abstract: Mill processing of ingots and like metal articles at or after bringing to temperatures above about 900.degree. C. is enhanced through self-heat soaking at such high temperatures to homogenize temperature and structural parameters throughout the body of such article. In particular this improves workability of such article for forging or rolling. The insulation comprises thin metal foils or the like separated by alternating layers of subdivided fibrous insulation, preferably in felted, woven or other sheet form and structured to maintain structural integrity at such high temperatures, and provides insulation of the metal article surrounded by such insulation and reduces scale formation and eliminates the need for flame or other external heat source or the need for heavy and/or voluminous handling and furnace equipment.