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:
Feb. 20, 2001
Filed:
Sep. 25, 1998
Applicant:
Inventor:
Lennart L. Carlson, Newport Coast, CA (US);
Assignee:
Steward Plastics, Inc., Laguna Hills, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B65H 8/100 ;
U.S. Cl.
CPC ...
B65H 8/100 ;
Abstract
A flexible double-walled plastic tubing product includes a helically wound support bead between inner and outer walls, and an helically wrapped electrical resistance heating conductor is disposed adjacent to the inner wall in good heat transfer relation to fluid flow within the tubing product. Fluid flow within the tubing product is insulated against heat loss to ambient by the helical support bead and a trapped “dead-air” space between the walls of the tubing product. Apparatus and method for making the tubing product are disclosed.