Pipe joints or couplings – Materials – Nonmetallic
Reexamination Certificate
2005-02-22
2005-02-22
Hewitt, James M. (Department: 3679)
Pipe joints or couplings
Materials
Nonmetallic
C285S382000, C285S021100, C285S381100, C285S293100, C285S294100, C285S041000, C285S331000, C285S334500
Reexamination Certificate
active
06857670
ABSTRACT:
An apparatus for creating a permanent, leak-proof plastic tubing joint including a length of plastic tubing, a fitting component and a device capable of generating a local electromagnetic field. The fitting component is manufactured of a polymer containing nonpolymeric particles capable of absorbing a specific frequency of electromagnetic energy. An end of the length of plastic tubing is slidably inserted into the fitting component. When the tubing has been fully inserted, a device is activated to generate a local electromagnetic field surrounding the fitting component. The nonpolymeric particles absorb the electromagnetic energy and increase in temperature. This temperature increase causes the fitting component to begin melting at the interface with the plastic tubing while at the same time causing the end of plastic tubing to become pliable. The electromagnetic field is then removed and both the fitting component and the end of plastic tubing cool to ambient temperature. Upon cooling, the fitting component has melted in place surrounding the plastic tubing creating a permanent seal.
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Cuno Incorporated
Hewitt James M.
Patterson Thuente, Skaar & Christensen, PA
Payne R. Thomas
Tomich John A.
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