Pipe joints or couplings – For plural component line – Metal and elastomeric layers
Patent
1974-10-23
1977-07-19
Arola, Dave W.
Pipe joints or couplings
For plural component line
Metal and elastomeric layers
29447, 285423, 285DIG10, F16L 4100
Patent
active
040365140
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.
REFERENCES:
patent: 2706134 (1955-04-01), Wilson et al.
patent: 2966373 (1960-12-01), Yount
patent: 2994933 (1961-08-01), Wolfe
patent: 3050786 (1962-08-01), St. John et al.
patent: 3320106 (1967-05-01), Kirkpatrick et al.
patent: 3382121 (1968-05-01), Sherlock
patent: 3406988 (1968-10-01), Jones
patent: 3526683 (1970-09-01), Heslop et al.
patent: 3758916 (1973-09-01), Wetmore
Arola Dave W.
E. I. Du Pont de Nemours and Company
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