Stock material or miscellaneous articles – Composite – Of metal
Reexamination Certificate
2005-05-10
2005-05-10
Tarazano, D. Lawrence (Department: 1773)
Stock material or miscellaneous articles
Composite
Of metal
C428S332000, C428S458000, C408S0010BD
Reexamination Certificate
active
06890664
ABSTRACT:
An entry board for use in drilling small holes in boards: the entry board comprises a lubricant layer of a mixture of a polyethylene glycol having an average molecular weight of at least 3000 to less than 10000, a polyethylene glycol having an average molecular weight of at least 10000 and trimethylolpropane formed over at least one surface of an aluminum base board with an undercoat layer of a partially saponified product of polyvinyl acetate provided between the lubricant layer and the base board. The partially saponified polyvinyl acetate has a degree of saponified 15 to 70 mole % and has an average molecular weight of 9000 to 50000. The adhesion of the lubricant layer to the base board is excellent, and the lubricant layer prevents cracking.
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Kaburagi Shingo
Kawai Hideo
Takada Susumu
Uda Yoshikazu
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ohtomo Chemical Inc., Corp.
Showa Denko Packaging Co.
Tarazano D. Lawrence
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