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:
May. 05, 2020
Filed:
Oct. 21, 2015
Applicant:
British American Tobacco (Investments) Limited, London, GB;
Inventors:
Graham Plews, London, GB;
Richard Pike, London, GB;
Assignee:
British American Tobacco (Investments) Limited, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16L 9/18 (2006.01); A24F 47/00 (2020.01); B29C 48/09 (2019.01); F28F 21/06 (2006.01); F28D 7/10 (2006.01); F28D 20/02 (2006.01);
U.S. Cl.
CPC ...
A24F 47/006 (2013.01); B29C 48/09 (2019.02); F16L 9/18 (2013.01); F28D 7/106 (2013.01); F28D 20/02 (2013.01); F28D 20/028 (2013.01); F28F 21/062 (2013.01); Y02E 60/145 (2013.01);
Abstract
A method for manufacturing a double-walled tube is provided. The method comprises the extrusion of two tubes wherein one tube is inside the other. A first mold is provided around the outside of the outer tube and a support provided along the inside of the inner tube. Fluid is then injected into the cavity between the inner and outer tubes to mold the outer tube against the first mold.