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By Paul Eisler

The autobiography of Paul Eisler, recounting his invention and pioneering of the broadcast circuit in the course of the blitz on London in the course of global struggle II. It levels from a desirable behind-the scenes document of ways the discovery used to be used in the course of the conflict to an exam of the patent method itself and the evolutionary strategy from notion to product

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Initiating the production of wide, thin copperfoil as the most Page 49 essential part of the raw material for the foil technique was the main requirement for supplying a hopefully budding printed circuit industry with the equivalent to what the printing paper is to the printing industry. But this was not the only need. As the first printed circuit radio set which we demonstrated in the early 1940s had already shown, the discrete components available at the time (and long after) required a stiff panel for their support with the network of their interconnections on one or both surfaces of the panel.

It was with the production of these boards that the directors of Technograph were to fail once again to obtain an advantageous arrangement for the company. In our laboratory we had produced copperfoil clad boards for our own experimental and sample production using rolled copperfoil or our own electrodeposited copperfoil. It was not a simple job to bond the foil either to the available phenolic board, or to board made by ourselves with impregnated papers. We got a small, manually operated hydraulic press with electrically heated and water cooled platens and after prolonged trials and seeking the advice of several metallurgical and adhesive experts we succeeded in finding a satisfactory treatment of the copperfoil and of adhesive compounds ("bonding media") to give a very good bond not affected by the soldering temperature or by the other criteria we had stipulated.

Patent have contributed to the ideas which made the integrated circuits (IC's) of today such enormously important components. They are generally referred to as "chips". A chip means today a silicon wafer of a few millimeter square constituting a single package for hundred thousands of transistors integrated to form a micro-electronic circuit. 4 It was a scientific breakthrough for the goal of the electronic switch. Of the three inventorsJohn Bardeen, Walter Brittain and William ShockleyShockley got furthest.

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