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:
Mar. 28, 1978
Filed:
Dec. 08, 1975
Applicant:
Inventors:
Hein Bulters, Vroomshoop, NL;
Gerrit Heidemann, Oldenzaal, NL;
Warner Jan DE Putter, Hardenberg, NL;
Assignee:
Industriele Onderneming Wavin N.V., Zwolle, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16L / ; B65H / ;
U.S. Cl.
CPC ...
138125 ; 138126 ; 138137 ; 138175 ; 138177 ; 138176 ; 138145 ; 156 622 ; 156172 ; 156173 ; 156187 ; 156276 ;
Abstract
The invention relates to a sandwich tube comprising an inner and an outer fiber reinforced layer of thermosetting resin and an intermediate layer therebetween consisting of inorganic filler material coated with thermosetting resin and obtained by spraying a finely divided resin into a case of loosely laid inorganic filler material. A non woven is present between the intermediate layer and the outer fiber reinforced layer.