Electric heating – Heating devices – Tool or instrument
Reexamination Certificate
2004-02-17
2009-10-13
Paik, Sang Y (Department: 3742)
Electric heating
Heating devices
Tool or instrument
C285S405000
Reexamination Certificate
active
07601931
ABSTRACT:
A simpler method and apparatus for joining plastic pipe (2) is provided by creating a flange ring (4) on the end of a plastic pipe (2), the flange ring (4) being cut from a short length of a larger dimension plastic pipe selected or machined to fit closely over the outer diameter of the plastic pipe (2) to provide a flange (4) which may be bolted or fastened to a similar flange. A similar method may be used to provide a connection by means of a coupling.
REFERENCES:
patent: 3796449 (1974-03-01), McLaughlin et al.
patent: 3972548 (1976-08-01), Roseen
patent: 4070044 (1978-01-01), Carrow
patent: 5015017 (1991-05-01), Geary
patent: 5462706 (1995-10-01), McMillan et al.
patent: 1217116 (1990-07-01), None
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