Electric heating – Metal heating – By arc
Reexamination Certificate
2005-05-17
2005-05-17
Evans, Geoffrey S. (Department: 1725)
Electric heating
Metal heating
By arc
C219S121710
Reexamination Certificate
active
06894250
ABSTRACT:
In a method for the continuous manufacture of drip irrigation tubes which comprise a tube body (1) into which dosing elements are set (6), a hole is created in the walling of the tube body (1). This takes place by a laser beam (13) which is directed by an optical device (16). This optical device (16) has the effect of converting the laser beam (13) into the form of a ring, a line (19) of high energy density being formed corresponding substantially to the ring shape at a separation (a) from optical device (16), in which a particle (20) is cut from the walling.
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Brezner David J.
Dorsey & Whitney LLP
Evans Geoffrey S.
Johnson Victor E.
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