Electric heating – Heating devices – Tool or instrument
Reexamination Certificate
2006-04-18
2006-04-18
Jeffery, John A. (Department: 3742)
Electric heating
Heating devices
Tool or instrument
C228S054000
Reexamination Certificate
active
07030339
ABSTRACT:
A soldering iron tip having a copper or copper alloy core and a metal particle sintered member connected to the core to transfer heat therefrom to form a working soldering tip. The sintered member can be manufactured by powder metallurgy from a base material (iron, nickel and/or cobalt particles) and an additive (silicon, copper, silver, tin, boron and/or carbon particles) where needed. The sintered member can be formed as a cap which is fitted onto the working tip with a silver paste sandwiched therebetween, a brazing filler metal ring is positioned between an abutment shoulder and the cap, flux applied to the joint and the cap brazed into place. A metal, cermet or ceramic coating sprayed on the outer surface of the core, except for the (masked) working tip end, is not wettable by solder. An Ag—Al—Cu alloy coating layer in the rearwardly-disposed cavity improves heat conduction from the heater therein.
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Miyabe Masayuki
Nagase Takashi
Naito Takanori
Sekimori Norihisa
Teraoka Yoshimoto
Hakko Corporation
Jeffery John A.
Squire Sanders & Dempsey LLP
LandOfFree
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