Abstract:
An electronic supervisory circuit indicates the condition of a telegraphy line being supervised without interfering with the transmission of the telegraphy signals. The supervisory circuit employs a holding circuit responsive to the detection of modulated line signals which maintains the output of the supervisory circuit during the periods when the modulated signals are transmitted over the telegraphy line. An auxiliary output is also employed to indicate the instantaneous condition of the line.
Abstract:
Two-speed routing device for a telegraphic subscriber, enabling the use of the two modulation speeds, one called ''''normal'''' and the other called ''''fast,'''' the fee being different in each case; this device, placed in a link-up exchange, comprises a single line equipment set whose inputs are linked with the input distributor, and a call discriminator element which controls the tripping of a discriminator relay ensuring the changing from one speed of use to another.
Abstract:
Pulse discriminator device comprising a blocking circuit with a time constant, detecting the appearance of a given polarity, memorizing, during a certain period, the said polarity, and enabling, during that period, the detection of an opposite polarity, a detection and control circuit detecting this opposite polarity and acting on a control circuit which signals, at the output, the detection of this opposite polarity and a maintenance circuit dependent on the control circuit and enabling the first polarity to be kept in the memory while the opposite polarity is being received.
Abstract:
The line equipment device comprises a first transistor circuit connected in parallel with the said line, controlling the currents flowing along line wires A and B, a second transistor circuit detecting the polarity of the said line wire, a third transistor circuit connected to the second circuit, causing a delay in the transmission of the state of a line wire, a fourth transistor circuit connected to the first circuit indicating to selecting devices the state of readiness for operation or occupancy of the line equipment, and a fifth transistor circuit connected to the fourth circuit for use in case of line outings.
Abstract:
The device comprises, on the one hand, a bistable device transistors which forms a bistable flip-flop, and, on the other hand, a device consisting of a capacitor and high time-constant transistors, the latter device comprising a field-effect transistor capable of introducing itself, on a first order, into one of the bridges of the bistable device to destroy the latter''s symmetry, the bistable state thus created being liable to come to an end before exhaustion of the time-constant on a second order transmitted to the bistable device.
Abstract:
The pressure regulation system for a vacuum chamber (1), connected by pipes to a pump unit (3) with a primary mechanical dry pump (4) and a secondary pump (5), has a speed controller (6) simultaneously setting speed of the primary and secondary pumps. The speed controller uses predetermined speed profiles (20) computed from condensation curves for effluents contained in the chamber and pipes.
Abstract:
The pressure regulation system for a vacuum chamber (1), connected by pipes to a pump unit (3) with a primary mechanical dry pump (4) and a secondary pump (5), has a speed controller (6) simultaneously setting speed of the primary and secondary pumps. The speed controller uses predetermined speed profiles (20) computed from condensation curves for effluents contained in the chamber and pipes.
Abstract:
The device has two pumps (2,8) coupled to respective control units (3,11) for controlling the speed of the pump. A control valve (4) is coupled to an input of the pump (2) and to a third control unit (5) that controls the control valve. An inert gas injector (6) injects inert gas into the control valve through an injection pipe equipped with an injection valve. The injection valve is controlled by a fourth control unit. The control valve is controlled by the third control unit to compensate the rapid variations of weak amplitudes of pressure and flow of gas in processing chamber. The flow of the inert gas in the inert gas injector is controlled by the fourth control unit to compensate the variation of strong amplitude of the pressure and flow of gas in the processing chamber. The speeds of the two pumps are controlled by the respective control units to compensate the high variations of the amplitude of the conditions of pressure in the processing chamber. Independent claims are also included for the following: (a) a semiconductor fabrication installation or microelectronic mechanical system (b) a process of fabrication of semiconductors or the microelectronic mechanical system.