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. 01, 1980
Filed:
Feb. 06, 1978
Edmond Michel, Brussels, BE;
Solvay & Cie., Brussels, BE;
Abstract
Production of oriented hollow plastic bodies having a more uniform wall thickness by formation of elongated preforms of which one end is closed and the other is open and has a molded neck, heat conditioning of the preforms at a temperature which allows the plastic to be oriented by stretching, introduction of the preforms into blow molds the cavities of which have a greater length than the length of the preforms and reproduce the shape of the desired hollow bodies and blowing of the preforms by introducing an expansion fluid into the preforms through their open end in which the expansion fluid is introduced into the preforms towards their bottom along a direction substantially parallel to their longitudinal axis and at a distance from their bottom which is between 20 and 60% of their length which is subjected to expansion.