Sean M Redfern

US Patent:

20050112344, May 26, 2005

Filed:

Aug 19, 2004

Appl. No.:

10/922382

Inventors:

Sean Redfern - Newport Beach CA, US
Paul St. John - Corona CA, US
James Miller - Brea CA, US

International Classification:

B32B007/02

US Classification:

428213000, 428211100

Abstract:

This invention relates to materials and methods of drilling printed circuit boards. In one embodiment, this invention provides a lubricated backup board comprising a core material, a lubricant, and an outer shell material and a process for using said backup board. In another embodiment, this invention provides an entry board comprising a lubricant and an outer shell material and a process for using said entry board. In preferred embodiments the lubricant layers are substantially separate and distinct layers. In preferred embodiments, adhesive is used to secure the layers together. In one embodiment, said processes allows for reuse and/or replacement of various layers of preferred backup and/or entry boards.

US Patent:

20090214308, Aug 27, 2009

Filed:

Sep 26, 2008

Appl. No.:

12/239683

Inventors:

Sean Matthew Redfern - Newport Beach CA, US
James Joseph Miller - Brea CA, US
Paul Ronald St John - Corona CA, US

International Classification:

B23B 49/02
B23B 35/00

US Classification:

408 1 R, 408115 B, 408 3

Abstract:

An entry sheet comprising polymer material for drilling printed circuit boards is provided. The entry sheet is suitable for use with a broad range of diameters, including commonly available drill diameters. The entry sheet comprises an adhesive epoxy configured to, among others, resist drill deflection, resist mechanical damage, and reduce to dust such that the entry sheet may increase drilling accuracy, protect printed circuit board from damage, minimize entry burrs, and may addresses other issues such as fliers, bird nesting, and the like.