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Dive into the research topics where Patrick N. Keifer is active.

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Featured researches published by Patrick N. Keifer.


Archive | 2010

Imaging indicator for ESD safety testing.

LeRoy L. Whinnery; Patrick N. Keifer; April Nissen; Alex Tyson

This report describes the development of a new detection method for electrostatic discharge (ESD) testing of explosives, using a single-lens reflex (SLR) digital camera and a 200-mm macro lens. This method has demonstrated several distinct advantages to other current ESD detection methods, including the creation of a permanent record, an enlarged image for real-time viewing as well as extended periods of review, and ability to combine with most other Go/No-Go sensors. This report includes details of the method, including camera settings and position, and results with wellcharacterized explosives PETN and RDX, and two ESD-sensitive aluminum powders.


Proceedings of SPIE | 2003

Sacrificial layer for the fabrication of electroformed cantilevered LIGA microparts

Alfredo M. Morales; Georg Aigeldinger; Michelle A. Bankert; Linda A. Domeier; John T. Hachman; Cheryl Hauck; Patrick N. Keifer; Karen Lee Krafcik; Dorrance E. McLean; Peter C. Yang

The use of silver filled PMMA as a sacrificial layer for the fabrication of multilevel LIGA microparts is presented. In this technique, a bottom level of standard electroformed LIGA parts is first produced on a metallized substrate such as a silicon wafer. A methyl methacrylate formulation mixed with silver particles is then cast and polymerized around the bottom level of metal parts to produce a conducting sacrificial layer. A second level of PMMA x-ray resist is adhered to the bottom level of metal parts and conducting PMMA and patterned to form another level of electroformed features. This presentation will discuss some the requirements for the successful fabrication of multilevel, cantilevered LIGA microparts. It will be shown that by using a silver filled PMMA, a sacrificial layer can be quickly applied around LIGA components; cantilevered microparts can be electroformed; and the final parts can be quickly released by dissolving the sacrificial layer in acetone.


Archive | 2002

Compliant cantilevered micromold and use thereof in replication of cantilevered microparts

Alfredo M. Morales; Linda A. Domeier; Marcela G. Gonzales; Patrick N. Keifer; Terry J. Garino


Archive | 2002

Castable plastic mold with electroplatable base and associated method of manufacture

Linda A. Domeier; Alfredo M. Morales; Marcela G. Gonzales; Patrick N. Keifer


Archive | 2008

Method for providing a compliant cantilevered micromold

Alfredo M. Morales; Linda A. Domeier; Marcela G. Gonzales; Patrick N. Keifer; Terry J. Garino


Archive | 2002

Compliant cantilevered micromold

Alfredo M. Morales; Linda A. Domeier; Marcela G. Gonzales; Patrick N. Keifer; Terry J. Garino


Archive | 2013

Method for providing a low density high strength polyurethane foam

LeRoy L. Whinnery; Steven H. Goods; Dawn M. Skala; Craig C. Henderson; Patrick N. Keifer


Archive | 2009

Development and mechanical characterization of TufFoam.

LeRoy L. Whinnery; Steven H. Goods; Wei-Yang Lu; Patrick N. Keifer


Archive | 2007

A Series of Unfortunate Events - General Discussion of Materials Issues.

LeRoy L. Whinnery; Linda A. Domeier; Patrick N. Keifer


Archive | 2006

TufFoam(TM): A TDI-Free Water-Blown Polyurethane Foam.

LeRoy L. Whinnery; Steven H. Goods; Patrick N. Keifer

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LeRoy L. Whinnery

Sandia National Laboratories

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Linda A. Domeier

Sandia National Laboratories

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Alfredo M. Morales

Sandia National Laboratories

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Marcela G. Gonzales

Sandia National Laboratories

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Steven H. Goods

Sandia National Laboratories

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Terry J. Garino

Sandia National Laboratories

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April Nissen

Sandia National Laboratories

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Cheryl Hauck

Lawrence Berkeley National Laboratory

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Craig C. Henderson

Sandia National Laboratories

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Dawn M. Skala

Sandia National Laboratories

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