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:
Nov. 14, 2000
Filed:
Jul. 17, 1998
Applicant:
Inventor:
Werner Feistkorn, Saerbeck, DE;
Assignee:
Windmoller & Holscher, Lengerich, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264 401 ; 264 85 ; 264565 ; 425135 ;
Abstract
To prevent socalled fish eyes or to reduce the number of fish eyes per unit of area in plastic films, manufactured according to the casting process or according to the blown film process, the number of fish eyes per unit of area is measured in the tubular film, which is cast or blown or collapsed. When the measurement reveals a number of fish eyes per unit of area that exceed a specified value, nitrogen or antioxidants are blown or put into the hopper until the number of fish eyes per unit of area falls below a critical number.