Career:
1960 to 1963: Allvac Metals (Now: Teledyne Allvac): Metallurgist in the production of high temperature alloys and Alnico magnets
1964 to 1991: Crucible Steel Company (Later - Crucible Materials Corporation, Magnetics Division): Metallurgist. Q.C. Supervisor, Superintendant
From 1974 - V.P. Technlogy and General manager
From 1985 - President
Field of activity: Production, management, and process development of various permanent magnet alloys, including ferrites, Alnico, SmCot and Nd- Fe -B.
1991 to present: Technical consultant for permanent magnet alloys and processes
Patents:
"Method for Producing Dies for Use in Compacting Permanent Magnet Powders" Inventor: John J. DuPlessis
Main publications:
1. "About the Ternary System Cobalt - Zinc - Carbon" John J. DuPlessis and H. H. Stadelmaier; Metall. 8, Jahrg '61 (In German) 2. "Microstructural Features and Dislocations on Thermally etched Sapphire Surfaces" H. Palmour, III, John J. DuPlessis and W. W. Kriegel; Journal of the American Ceramic Society, V. 44 No. 8, 1961
3. "Microbrittleness Anisotropy in Thermally Etched Saphire" H. Palmour, John J. DuPlessis, and W. W. Kriegel; Mechanical Properties of Engineering Ceramics, Interscience, 1961
4. "Selected Abstracts on the Mechanical Behavior of Ceramics" H. Palmour, W. W. Kriegel, J. J. DuPlessis, and G. D. Harrell; Bulletin No. 73, Dept. of Engineering Research, N. C. State College(University), Raleigh, N. C, 1977
5. " Permanent Magnet Materials Available for Use in Relays" John J. DuPlessis and Dan C. Sloss; 31st Annual National Relay Conference, Oklahoma State University, Apr. 1983
6. "High Energy Magnets at Crucible - Present and Future" John J. DuPlessis Gorham Conference, Gorham Advanced Materials Institute Oct. 1987
7. "An Attractive Proposition, Permanent Magnets Are Playing a Bigger Role in Small and Innovative Products" John J. DuPlessis; Machine Design, June 1993
8. "Upgrading the Technology for Refining Fe-Ni-Co Containing Slag and Grinding Sludge" Presented at The 5th World Congress R'2000, Toronto, Canada, June 2000
9. "Melt Refining of Grinding Sludge Containing Cobalt and Nickel in ESCR Furnace" V. M. Sokolov and J. J. DuPlessis; Proceedings of the TMS Fall Extraction & Process Metallurgy Meeting: Lead - Zinc 2000 Symposium & The Fourth International Symposium of Metals and Engineered Materials Oct. 2000 Pittsburgh, PA.