Burroughs, Inc.

John E Benasutti

Robert E Braun

The present disclosure describes an insulated electrical contact pin for use in making wiring changes in an interconnection medium such as a printed circuit board or backplane. More specifically, the present pin replaces the original compliant press-fit type pin mounted in a plated-through hole on the board. The pin is formed in two sections--one section having a threaded extremity, and the other, a tapped bore to receive the former. The pin is mounted in a plated-through hole on the printed wiring board by screwing the two sections together. Portions of the pin sections are electrically insulated from the wiring traces situated on or below the board surface. The present contact pin is versatile, easy to install and tolerance-free with respect to the dimensions of the plated-through hole in which it is mounted.

Circuit change pin for printed wiring board

The present disclosure describes test coupons having predetermined respective test patterns, formed in a multilayer printed circuit board simultaneously with the fabrication of the latter. The test coupons are probed with conventional electrical instruments to provide information as to the occurrence of a misregistration of any given subsurface printed plane or trace, whether or not the misregistration exceeds a specified limit, and if desired, a measure of the degree of misregistration. The foregoing are readily accomplished in a time and cost efficient manner without the need for cross-sectioning portions of the board and the visual observation of the subsurface printed layers.

Test coupons for determining the registration of subsurface layers in a

The present disclosure describes an electrical connector for use with a printed wiring board. The connector design is characterized by an inner housing of insulative material for supporting a plurality of electrical contacts and an outer insulative structure which encloses the housing and is easily removable therefrom. The latter permits the cleaning of the electrical contacts after a soldering operation and also allows for the replacement of individual defective contacts. Additionally, if required for impedance or electrical interference considerations, the present connector utilizes an integral ground conductor plane which substantially encloses its outer insulative structure and is electrically connected to the ground plane of the printed wiring board.

Electrical connector for printed wiring board

The present disclosure describes a connector assembly especially suited for a large scale integration (LSI) package. The assembly includes a housing to accommodate the package and a hold-down lid or cover to insure reliable electrical connections between the package circuit leads and the contact elements disposed within the housing. The assembly is characterized by the ease with which the housing may be attached to the interconnection medium, such as a printed circuit board, and the hold-down cover may be fastened to the connector housing. The latter are accomplished by a plurality of metal pins which protrude from the interconnection medium, penetrate the housing, and engage locking slots in the cover.

Growing community of inventors

North Wales, PA, United States of America

John E Benasutti