International Business Machines Corporation

Terry Fredrick Banitt

John Lee Colbert

Jason R Eagle

Roger Scott Krabbenhoft

George M Moorefield, Ii

John Patrick Hagen

Thomas Donald Weller

Roger Willard Johnson

Carl Francis Sermon

Gary Allen Olson

A method and apparatus are provided for implementing electrical connection of two large circuit cards through multiple discrete land grid array (LGA) sites. Each of the circuit cards includes a plurality of LGA sites. A first circuit card includes a plurality of LGA interposers locally aligned at the respective LGA sites of the first circuit card. A board-to-board connection hardware assembly connecting a second circuit card to the first circuit card includes a elongated carrier defining a cavity receiving a plurality of load springs coupled to an associated bearing block for loading and maintaining flatness of the LGA sites.

Implementing connection of two large electronic boards utilizing LGA interconnect

A lapping plate topography system includes a measuring apparatus for measuring the surface of a lapping plate, and an analysis apparatus for analyzing and presenting the data resulting from such measurements. The measurement apparatus has a non-contacting capacitive probe for measuring a height of the surface of the lapping plate, a rotary arm assembly for moving the probe in an arc over the surface of the lapping plate, and a spindle assembly for rotating the lapping plate about its center. The computer-based analysis apparatus is operable to input from the measurement apparatus the measured height at a plurality of data points on the surface of the lapping plate, calculate Fourier transform harmonic coefficients based on the plurality of measured heights, calculate surface ripple coefficients based on the calculated Fourier transform harmonic coefficients, and output the calculated surface ripple coefficients to an appropriate display device.

Lapping plate topography system

A retainer clip is shown for retaining a device through an opening in a panel such as a printed circuit board, enclosure wall or similar structure. The clip surrounds the portion of the device projecting through the aperture and by a single longitudinal motion engages cooperating portions of the device to secure the device at the panel opening. The clip includes means for detenting in the assembled, locking position to prevent accidental release of the device from the secured, mounted condition.

Retaining clip for panel mounted input/output connector

Growing community of inventors

Altura, MN, United States of America

Terry Fredrick Banitt