A method of making a heat exchanger of the kind comprising a stack of sheet metal pressings in face to face relation, adjacent pairs of pressings providing between them alternately channels for flow of coolant and spaces for the flow of air, the method consisting of cold welding the pressings together.

A method of bulking yarn in package form comprises subjecting yarn in a substantially tensionless package to a heated fluid at a super atmospheric pressure. Also apparatus for performing the method and the bulked package.

A method and system for pumping-well control including determination of a production profile for the well. The profile consists of a function that defines the normal producing conditions when the well fluid is pumped out of the well at a greater rate than it is produced therein. Optimum producing conditions may then be determined and set. In addition, the magnitude of the load on the pump motor is monitored and fed out for remote indication and/or control.

In injection molding gramophone records, the material is injected into a cavity in which the region forming the transcription band is heated with a region around the periphery being cooled.

A system and method for pumping tools into and out of a well through fluid circulation passages in the well including fluid input and return passages communicating with each other in the well bore and with surface apparatus for controlling fluid flow through said passages. The surface apparatus includes a manifold system for directing flow through the well circulation passages in either direction and includes variable choke means in the fluid return portion of the manifold for a controlled back ...

This invention relates to improvements in remote control systems and operating methods. The embodiment selected for illustration is arranged for actuation of a valve in a submerged pipeline. The system includes a controlling station comprising a transmitter and a receiver of sonic signals and it includes a controlled station submerged with the valve and comprised of a receiver and a transmitter. The controlling station is capable of sending arming, interrogation and control signals to the contro...

A method and an apparatus for manufacturing corrugated board in which layers of material for the corrugated board are coated with a mixture of a thermoplastic and a wax which can be brought into liquid form and which after melting and setting on the layers keeps said layers together.

Chemical treatment of surfaces is limited to selected portions of the surface by applying inorganic resists to the surface in a desired pattern. In a specific example, silicon dioxide is deposited at a low temperature on a titanium surface surrounding a platinum interconnection pattern on a silicon semiconductor slice. The silicon dioxide is patterned to expose the platinum but cover the titanium. Gold is then electroplated onto the platinum in a well-defined pattern.

Transportation units for goods are prepared by placing the goods between pressure distributing means in the form of end plates with lateral displacement resistance means, concentrated load or shear distributing resisting means, or shear resisting means positioned at suitable intervals along the length of the unit, and the unit is then made to act as a prestressed beam or prestressed structural unit by applying pressure to the pressure distributing means by the use of tendons maintained under ten...

A method of producing a magnetic image of an information pattern provides a magnetizable medium having a transition between a first state of magnetization and a second state of magnetization at a first temperature and a transition between the second state of magnetization and the first state of magnetization at a second temperature. This method also includes the steps of imparting to the magnetizable medium a third temperature between the first and second temperatures so as to provide one of the...