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:
Apr. 02, 1991
Filed:
Oct. 05, 1989
Walter Kroisenbrunner, Kapfenberg, AT;
Boehler Ges. m.b.H., Kapfenberg, AT;
Abstract
Preliminary material for the production of composite material parts, consisting of a tubular outer part (1) and at least one core or inner part (2) and two sealing parts (3) positioned at the ends of the tubular outer part, as well as a process for the production of the preliminary material. The sealing parts (3) project at least partially into the outer part, and a surface pressure exists at the sealing surfaces (4). The materials of the outer part and the sealing parts have at least an equal thermal expansion coefficient and a fundamentally equal deformation resistance, and the material of the sealing parts have a higher distortion temperature. The process provides for thermal shrinkage of the sealing parts prior to insertion into the tubular part, and, when necessary, followed by evacuation of a residual cavity (6) between the inner and outer parts or filling of the residual cavity with inert gas.