In an oscillatory signal generator circuit, exceptionally low distortion is ensured by the use of a transistor common to multiple feedback loops that causes gain to be compressed as a logarithmic function of amplitude. Changes in output impedance or loop length are compensated for or equalized by shifting the compression threshold as a function of line voltage.

A chuck and an actuating device therefor, of which the chuck features rocker jaws with follower ends, and an axially movable jaw actuator having spaced faces in planes normal to the chuck axis with which the follower ends of the jaws are in line contact, and the actuating device provides a cylinder with a piston therein connected with the jaw actuator, and fluid-pressure distributing and control means sequentially operable to admit fluid of a given high pressure to the chuck-closing cylinder end...

Broadband low-pass filters containing inductors and/or capacitors wherein resonances of a main inductor and/or capacitor are obviated by utilizing single-turn inductors and/or low distributed inductance capacitors which have no self resonances below 200 MHz. and whose resonances do not coincide with the self resonances of the main components. The auxiliary components are connected so as to maintain the high-insertion loss of the filter at the self-resonant frequencies of the main components.

A reactor system for sequentially forming layers on substrates, by either reacting a gas with a surface of a substrate or by selective precipitation of constituents of a gas on a surface of a substrate, is disclosed. The uniformity of the layer is increased by rotating the substrate as the gas is passed over the surface of the substrate. Improved substrate temperature control is provided by optical heaters. Each reactor chamber has a low volume, thereby reducing the contamination problems associ...

A low flow safety valve according to the present invention relates to a valve construction that may be employed in conjunction with flow conduits such as well production tubing and the like. The valve construction is operative to allow the flow of production fluid through the valve structure as long as the rate of flowing pressurized fluid is above a predetermined minimum sufficient to develop a predetermined pressure differential across a restriction defined within the valve structure. As fluid...

A low potential electrode for use in a xerographic development system. The electrode is positioned adjacent to the point of entry of a moving image bearing photoconductive surface into a development zone and has associated therewith means for redirecting the flow of developer material moving between the electrode and the photoconductive surface whereby the developer material impinges against the photoconductive surface.

A cryostat for cooling superconducting windings in a homopolar dynamo-electric machine, which has two spaced inner members containing the windings and cooled by cryogenic fluid and an outer member enclosing a vacuum space around the inner members, wherein the refrigeration plant for the cryogenic fluid with the exception of the compressor, is disposed in the vacuum space between the inner members to eliminate the need for thermally insulated transfer lines.

A low data rate display is provided using light sources to represent range, and mechanical scanning of azimutn. In one embodiment a rotating arm synchronized to a rotating antenna has a number of light sources mounted along the length thereof each of which corresponds to a particular range and each of which is coupled to a particular range gate.

A low-friction catheter guide for facilitating the insertion of catheters into the vascular system of human beings or animals, especially where insertion through relatively long lengths of blood vessels is involved. Friction is minimized by forming a catheter guide over which the lumen of the enclosing catheter passes and contact between the two is reduced to a series of point contacts. The guide is formed in such a fashion that a series of radial extensions or protuberances constitute the conta...

Low pour, low sulfur fuel oils are prepared by thermally cracking a high sulfur, high pour point atmospheric residuum and blending the product with a high wax, low sulfur, high pour point atmospheric residuum. The pour point may be lowered further by the addition of a pour point depressant.