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. 18, 1978
Filed:
Jun. 03, 1975
Applicant:
Inventor:
Donald G Sauer, Harwington, CT (US);
Assignee:
National Can Corporation, Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ;
U.S. Cl.
CPC ...
264 89 ; 264 92 ; 264 93 ; 264292 ; 425388 ;
Abstract
Process for thermoforming hollow articles having large length to diameter ratios. A male mold assembly having an extendible head portion formed of a porous metal is employed with the male mold being passed through the plane of a heated plastic sheet while a vacuum is drawn through the porous metal head portion to draw the sheet against the male mold. The extendible head portion is extended to increase the depth of the formed article.