A method of manufacturing a transformer coil encapsulated in casting resin utilizing a disposable casting mold where the disposable mold acts both as a winding mandrel and as an inner mold shell for resin encapsulation. The disposable casting mold may be oval shaped or circular shaped depending upon...http://www.google.de/patents/US6223421?utm_source=gb-gplus-sharePatent US6223421 - Method of manufacturing a transformer coil with a disposable mandrel and mold
