The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2005
Filed:
Sep. 10, 2001
Shingo Kaburagi, Tokyo, JP;
Yoshikazu Uda, Tokyo, JP;
Susumu Takada, Shiga, JP;
Hideo Kawai, Shiga, JP;
Shingo Kaburagi, Tokyo, JP;
Yoshikazu Uda, Tokyo, JP;
Susumu Takada, Shiga, JP;
Hideo Kawai, Shiga, JP;
Ohtomo Chemical Inc., Corp., Tokyo, JP;
Showa Denko Packaging Co., Isehara, JP;
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.