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:
Dec. 16, 1980
Filed:
Mar. 29, 1979
Applicant:
Inventor:
Harry Ball, Piscataway, NJ (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
428136 ; 264146 ; 264154 ; 264163 ; 264209 ; 2642101 ; 264D / ;
Abstract
A method and apparatus for making webbed plastic tubing suitable for use as a support for a filter pad in a cartridge filter. The webbed tubing is made by extruding a thermoplastic polymer in the form of a tube, cutting slits in the tube, and expanding the still warm and plastic tube by passing it over a mandrel slightly larger in diameter than the unexpanded tube.