International Business Machines Corporation

Pamela Lulkoski

Robert Maynard Japp

Jeffrey McKeveny

Jan Obrzut

Kenneth Lynn Potter

David Erle Houser

Jonathan Craig Whitcomb

The glass transmittance of UV light having a wavelength of 365 nanometers is reduced by compounding an oxide or salt of at least one of Fe, Cu, Cr, Ce, Mn and mixtures thereof. The fiberglass cloth can be used for providing reinforced prepregs used in producing printed circuit boards or laminated chip carrier substrates.

UV absorbing glass cloth and use thereof

A method and apparatus for optimizing the drilling position of a multi-layer printed circuit board prior to drilling. Each board is x-rayed to determine location coordinates information of the inner layers of multi layer circuit board panels. An optimization process determines optimal locations for drilling. The board is then drilled according to the optimized coordinates. By minimizing misregistration between the drilled holes and inner layers of the multi layer semiconductor circuit board, the present invention reduces a significant cause of scrap to the circuit board industry as well as removing a major impediment to further increasing circuit density and wireability.

Minimum error algorithm/program

Growing community of inventors

Vestal, NY, United States of America

Pamela Lulkoski