The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 1983
Filed:
May. 21, 1981
Claude Tournut, Francheville, FR;
Produits Chimiques Ugine Kuhlmann, Courbevoie, FR;
Abstract
The invention relates to a process for providing an adherent coating of polytetrafluoroethylene (PTFE) on the inner walls of a hollow metal body wherein a flexible membrane is used to form a space between the inner walls of the hollow metal body and the inner walls of a flexible membrane, filling the space with PTFE, compressing the PTFE by deformation of the membrane under isostatic pressure, removing the membrane, filling the inner cavities of the hollow metal body with a substantially incompressible solid substance having fluid flow characteristics and being thermally stable at the temperatures to which the PTFE is to be heated, heating the thus-formed assembly to a temperature above the melting point of the polytetrafluoroethylene for a period of time sufficient for the latter to lose its crystallinity.