Improvements in or relating to printed circuits

Abstract

Abstract 738,575. Printed circuits. STANDARD TELEPHONES & CABLES, Ltd. Dec. 12, 1952 [Dec. 21, 1951], No. 30008/51. Addition to 718,811. Drawings to Specification. Class 36. The conductivity of part or all of the tracks of a circuit printed on organdie according to the method disclosed in the parent Specification is increased by depositing good-conducting metal thereon by electrodeposition. Where two parts of a circuit on the same or different sheets of organdie are required to be joined they may be brought into contact, the conducting metal then being deposited to make electrical connection between -the two parts. The circuit may be attached to the surface of a sheet of insulating material, or embedded between two sheets of insulating material by an adhesive, by the application of heat and pressure or by softening the surface of the insulation with a solvent and then laying on or pressing in the circuit. Alternatively the circuit may be laid in a mould, which may contain a layer of thermosetting material, and which is then filled with thermosetting material and subjected to heat and pressure to cure the thermosetting material as disclosed in Specification 738,265.

Inventors

• 👤 John Albert Leno

Bibliographic Details