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. 04, 1999
Filed:
Aug. 08, 1996
Changize Sadr, North York, CA;
Jamie White, Caledon East, CA;
Salflex Polymers Ltd., Ontario, CA;
Abstract
A blow molded product which is generally tubular having first and second open ends and, a bellows section intermediate said first and second ends so that said product is flexible, has a skirt adjacent one of said first and second ends. The bellows section is formed in a blow molding operation and the skirt section is formed by compression molding. A preferred embodiment of the product has a rib extending internally of the wall of the blow molded section to strengthen the transition region between the bellows section and the compression compresses the steps of confining a parison in a mold and then introducing a core into the parison in the mold. The core moves thermoplastic material axially and possibly also radially and circumferentially. This process enables molding of a product with an external surface which may be substantially cylindrical with an internal surface which has lobes, ribs or other internal projections.