Title: Pipe fitting

Abstract: A pipe fitting of organic polymeric material such as polyethylene is provided wherein said pipe fitting is of unitary construction and includes a first tubular body portion of substantially uniform internal and external diameters integrally connected to a tapered heat-expandable tubular body portion having an external diameter at its terminal end less than the external diameter of the first tubular body portion. A method for making said pipe fitting also is provided which includes placing a tubular structure of organic polymeric material into a mold having a molding surface corresponding to that of said pipe fitting and cold-forming said tubular structure by pressing said tubular structure in said mold.

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Inventors: Hannover, Finn (Wilmington, DE, US)

Application Number: 517225
Filing Date: 1974-10-23
Publication_date: 1977-07-19
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Class(es): 285/222 29/447, 285/423, 285/909
Other Classes:
US Patent Ref:

2706134	Apr, 1955	Wilson et al.	285/156.
2966373	Dec, 1960	Yount	285/423.
2994933	Aug, 1961	Wolfe	85/37.
3050786	Aug, 1962	St. John et al.	285/DIG.
3320106	May, 1967	Kirkpatrick et al.	85/37.
3382121	May, 1968	Sherlock	264/230.
3406988	Oct, 1968	Jones	285/156.
3526683	Sep, 1970	Heslop et al.	264/230.
3758916	Sep, 1973	Wetmore	16/2.

Other Refs: 648,887

Aug, 1928	FR

Primary Examiner: Arola, Dave W.
Assistant Examiner:
Attorney: