A device for the ablation of tissue for use with the fingers of a human hand and a radio frequency power supply and controller providing a source of radio frequency energy and controls for controlling the application of radio frequency energy to the device comprising a handle sized so that is adapted to be grasped and supported by the human hand and having proximal and distal extremities. A single conductive needle formed of a conducting material is disposed in the distal extremity of the handle...

Sheet-gauging apparatus for gauging properties of sheet material and having upper and lower gauging heads with timing belt means for precisely moving the gauging heads with respect to the sheet material.

Transparent glass mask having a copper stain formed therein, the outer perimeters of which have a depth greater than the inner portion of the stain and a method for making the same in which a pattern of aluminum is formed on the glass and serves as a mask for driving the copper into the glass.

Electronic control apparatus and method using stepping motors which are operated open loop and which are slaved to counters so that the stepping motors first can be operated in a learn mode and information recorded in a memory, and thereafter operated automatically by use of the information recorded in the memory.

A phase detector comprising two trigger circuits each of which receives an input signal and converts the signal into square wave signals having the same frequency and phase as the input signal, and means for combining, integrating and rectifying the combined signal to provide an output signal which is proportional to the phase difference.

A self-contained voting booth which may be collapsed and enclosed entirely within and upon a compact carrying case for ease of transportation and storage. Integral extensible and retractable leg structures permit positioning of the booth at any desired location when extended yet do not interfere when retracted with support of the booth on another supporting surface when use of the leg structures is not desirable. The case structure includes retractable sidewall privacy panels and a light source ...

An improved exhalation valve for a mechanical respirator. The valve includes valving elements combined in a cartridge adapted for ready insertion and removal into a valve housing for convenient assembly and disassembly. A valve closure member in the cartridge occludes the exhalation flow path in a manner decreasing flow turbulence and valve flutter. The valve head on the closure member is formed by a surface of revolution generated by a curve of constant radius, and includes a cylindrical skirt ...

A device for transferring viscous fluids, such as catsup, from one bottle to another wherein an expansion chamber is provided between the pouring spouts of the bottles to enhance the downward flow of catsup by relieving the central portions thereof to permit air displaced from the lower bottle to bubble up through the flowing catsup into the upper bottle.

A learning circuit of the type adapted to converge on a desired output in response to solution control signals. A number generator is provided for producing digital circuit input signals according to a predetermined probability distribution. A digital to analog converter converts the digital input signals to discrete analog input currents. Another digital to analog converter is responsive to digital solution control signals for producing discrete analog solution control currents. A digital count...

A bilateral current source is provided for generating equal and opposite sourcing and sinking currents which are useful, for example, in linearly charging and discharging a capacitor. A reference current source utilizes a lateral PNP transistor to provide high output impedance and NPN transistor are interconnected with the lateral PNP transistor to insure that a reference current output is independent of the lateral PNP transistor's .beta. and temperature variations. A pair of diode arrangements...