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Publication numberUST900024 I4
Publication typeGrant
Publication dateJul 25, 1972
Filing dateJun 1, 1971
Priority dateJun 1, 1971
Publication numberUS T900024 I4, US T900024I4, US-I4-T900024, UST900024 I4, UST900024I4
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Extrusion apparatus for manufacture of thermoplastic pipe
US T900024 I4
Abstract  available in
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Description  (OCR text may contain errors)

DEFENSIVE PUBLIGATIUN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public-for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter;

PUBLISHED JULY 25, 1972 T900,024 EXTRUSION APPARATUS FOR MANUFACTURE OF THERMOPLASTIC PIPE Edward R. Hollander, Jr., 124 Bloomingdale Pike, Apt. 27, Kingsport, Tenn. 37 660 Filed June 1, 1971, Ser. No. 148,566

Int. Cl, 329d 23/04 US. Cl. 18-14 A 1 Sheet Drawing. 10 Pages Specification Improved apparatus for the manufacture of plastic pipe and tubing including a forming die, a sizing plate, a water cooling bath contained in a closed chamber wherein a partial vacuum is maintained, the improvement Which consists in provision of a hollow tubular cooling element attached to or unitary with the sizing plate around the entire rim of the sizing orifice to form a chamber through which a coolant is continuously circulated. This element is particularly characterized by presenting a smooth, cooled, rounded edge circular sizing orifice to prevent formation of defects in the outer surface of the pipe which might otherwise arise from adhesion of the molten plastic to the metal surface of the sizing orifice, or from irregularities in the surface of an unrounded orifice, thus eliminating the need for employment of any type of lubricant at the sizing orifice.

July 25, 1972 E. R. HOLLANDER, JR T900924 EXTRUSION APPARATUS FOR MANUFACTURE OF THERMOPLASTIC PIPE Filed June 1 EDWARD R. HOLLANDER, JR

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5447665 *Jan 25, 1993Sep 5, 1995Nupipe, Inc.Method of removal of replacement pipe installed in an existing conduit
US5587126 *Jun 7, 1995Dec 24, 1996Nupipe, Inc.Method of manufacturing a pipe liner for installation in an existing conduit
US6135748 *Jun 7, 1995Oct 24, 2000Ina Acquisition Corp.Apparatus for manufacturing a replacement pipe liner in reduced form
Classifications
U.S. Classification425/71, 425/378.1, 425/325
International ClassificationB29C47/00, B29C47/90
Cooperative ClassificationB29C47/0023, B29C47/0026, B29C47/903
European ClassificationB29C47/90B3