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:
Apr. 16, 1996
Filed:
Aug. 04, 1994
Takuji Nakano, Kusatsu, JP;
Takeshi Fujita, Uji, JP;
Katsuaki Matsuo, Kyoto, JP;
Chuzo Isoda, Uji, JP;
Dai-Ichi Kogyo Seiyaku Co., Ltd., Kyoto, JP;
Abstract
First of all, a high molecular sheet comprising a composite whose principal component is a special water soluble high molecular compound, or a multilayer sheet wherein a water soluble high molecular layer is piled on sheet material is prepared. Then, said sheet is layered on the entry side of a lamination substrate comprising insulating material and metallic foil. In this state, thru-holes are formed in the lamination substrate through said sheet. When forming thru-holes, said water soluble high molecular compound serves as a lubricant so as to extend drill life. In addition, it is possible to drill a lot of substrates, which are layered, at one time, resulting in the improvement of production efficiency.