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:
Sep. 28, 1976
Filed:
Jan. 06, 1975
Nathaniel Convers Wyeth, Mendenhall, PA (US);
Frank William Arnoth, Wilmington, DE (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Apparatus is disclosed for making a hollow, rib-reinforced article from a composite preform of two thermoplastic sheets. One sheet has a pattern of ridges or grooves, on a surface which contacts the other sheet, to permit the free flow of fluid from a marginal edge to interior regions of the preform. The apparatus includes (1) a heater, (2) mold platens which include a rib-forming mold cavity, (3) a ram to close and hold the mold platen in contact with the composite preform, and (4) a manifold which supplies a pressurized fluid to a marginal edge of the preform, thereby distending the thermoplastic sheet into the mold cavity. Then, the ram is further closed to seal nondistended areas of the preform, forming a hollow, laminated article.