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:
Oct. 10, 2000
Filed:
May. 20, 1997
Applicant:
Inventor:
Walter Rudolf Harfmann, Matthews, NC (US);
Assignee:
Genpak, L.L.C., Glens Falls, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
C08J / ;
U.S. Cl.
CPC ...
521 48 ; 156 84 ; 156 99 ; 264 37 ; 264321 ; 264322 ; 2643 / ; 264D / ;
Abstract
PET foam is processed into flakes. The flakes are densified in a pellet mill at between about 300.degree. F. and about 350.degree. F. to produce pellets. The pellets are then dried in a desiccant dryer at about 350.degree. F. for about 6 hours, so that the dew point of the pellets reaches about -40.degree. F. The dried pellets have an intrinsic viscosity about equal to virgin PET and a crystallinity greater than 20%. This material can be reused as if it were virgin PET.