John David Larnerd

US Patent:

46764267, Jun 30, 1987

Filed:

Mar 10, 1986

Appl. No.:

6/837817

Inventors:

Russell E. Darrow - Endicott NY
Alan J. Emerick - Warren Center PA
John D. Larnerd - Owego NY

Assignee:

IBM Corp. - Armonk NY

International Classification:

B23K 3100

US Classification:

228125

Abstract:

A method of solder leveling in printed circuit boards or other circuitized substrates. Flux is first applied to the surface of the substrate to be soldered. Molten solder is then applied to the fluxed surface after which the soldered substrate is cooled to a temperature below 300. degree. F. Molten solder is then again applied to the previously soldered surface of the substrate. This last step results in leveling the solder first applied to the substrate, including removal of any solder balls which had been formed over recessed pins and flush filling of passage holes formed in the substrate. The method can be performed without regard to the surface condition of the substrate, the composition of flux and solder, whether the substrate is of the thin film type or of the thick film type, nor whether dip soldering or wave soldering techniques are used. The invention also incompasses the end product resulting from use of the method.

US Patent:

51660377, Nov 24, 1992

Filed:

Feb 14, 1991

Appl. No.:

7/655479

Inventors:

John M. Atkinson - Endwell NY
Russell E. Darrow - Endicott NY
John D. Larnerd - Owego NY
Ronald J. Moore - Binghamton NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

B05D 300
G03C 500

US Classification:

430315

Abstract:

Disclosed is a method of fabricating a microelectronic package, especially a microelectronic package having copper circuitization on a dielectric substrate. The method includes the steps of depositing, imaging, developing the photoresist for additive circuitization, and forming a pattern of copper circuitization on the so exposed portions of the package. In order to avoid the formation of deleterious air bubbles on the exposed walls of the imaged and developed resist, the panel is exposed to and wetted by a liquid mist.

US Patent:

45504938, Nov 5, 1985

Filed:

Feb 8, 1984

Appl. No.:

6/578147

Inventors:

Russell E. Darrow - Endicott NY
Glenn J. Ingraham - Vestal NY
John D. Larnerd - Owego NY
Robert W. Nesky - Nicholson PA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H05K 332

US Classification:

29739

Abstract:

A machine for forming a head and a bulge on a copper pin and to connect the pin to a ceramic substrate by a single application of impact force at high velocity and controlled energy conditions includes an air cylinder within which a piston of controlled mass moves due to the effect of compressed air stored in an accumulator. A die block includes a two dimensional array of holes into which are fitted pin blanks that extend above the surface of the die block and on which is fitted a substrate having an identical array of pin holes formed therein. The pins are fitted within the die block and on the substrate such that a predetermined length of the pin blank extends above the surface of the substrate and a controlled length of the pin blanks extends between the substrate and the die block. The pins are retained within the die against axial movement and the holes in the substrate and die block provide radial restraint to the pins following the application of the impact force. The substrate is elastically supported to deflect after impact while the pin head and bulge are forming.