The present invention is a high-density circuit, wherein the circuit conductors, and the spaces between conductors, are preferably less than about 0.005 inches wide, and wherein the lines are disposed over a relatively large area. The circuit is defined by a pattern of grooves in a dielectric substrate,...http://www.google.com.au/patents/US5624708?utm_source=gb-gplus-sharePatent US5624708 - High-density circuit and method of its manufacture
