Friction materials (US Patent 3,660,120, 1972)

Eric Clark and Roger Adrian Summerling received US Patent No. 3,660,120 on May 2, 1972, filed May 14, 1968. It was assigned to Ferodo Ltd.

The patent's abstract:

A friction material comprising an inorganic fiber, such as asbestos, and a binder wholly or substantially wholly composed of metallic sulphide formed in situ, the metallic sulphide consisting of iron sulphide formed by the reaction of sulphur with iron powder or with lower iron sulphide, with or without copper sulphide formed by reaction of sulphur with copper powder or with cuprous sulphide. Additional materials such as metallic powders, fillers, antioxidants and friction modifiers may be included in the friction material. The material may be formed by a method which comprises compacting and curing a mixture of ingredients which contains sulphur with iron powder or lower iron sulfide, optionally with copper powder or cuprous sulphide. Curing may be carried out under a pressure of from 2 to 20 tons per square inch in the temperature range of 80* C to 600* C depending on the proportions of the sulphides in the binder.

Where it was listed

• Asbestos, November 1972, in its patents department (the year's issues)