MEEAA

Mapua Electrical Engineering Alumni Association

Engr. Salvador P. Umotoy

Former Director of Engineering, Applied Materials Inc. (USA)

Co-Founder & Director of Electrical/Mechanical Engineering, SIORAH, Inc. (USA)

Senior Engineering Director, MOCVD Startup (Shanghai, China)

Professional Electrical Engineer (PEE) with over 35 years of international experience in semiconductor R&D, electrical & mechanical design, and renewable energy systems. Known for his contributions to semiconductor equipment innovation, patented technologies, and solar manufacturing systems. Migrated to the U.S. in 1976 and built a successful career in Silicon Valley.

MEEAA
Excellence
Awardee
International Endeavor in Electrical Research & Development

His Story

Engr. Umotoy, a 1975 Mapúa Electrical Engineering graduate, built a distinguished career in the United States as a pioneer in semiconductor and solar technologies. After beginning his career at PLDT, he migrated to California in 1976, later joining Applied Materials, Inc., where he contributed to the development of state-of-the-art semiconductor equipment for CVD and ALD processes. Over the years, he earned recognition as part of 44 approved U.S. patents, authored multiple technical papers, and rose to Director of Engineering, leading product development and research in semiconductor and solar panel manufacturing.

In 2010, he co-founded SIORAH, Inc., where he directed engineering for innovative MOCVD reactor systems, filing additional patents and expanding his impact in advanced semiconductor equipment. He later took on a senior leadership role in Shanghai, developing LED manufacturing equipment and preparing nine more patent applications. With a career spanning decades of innovation, leadership, and global contributions, Engr. Umotoy retired in 2015, leaving behind a legacy of engineering excellence in both semiconductors and renewable energy.

 

Achievements

  • Patents & Research
    • Contributed to 44 approved U.S. Patents for Applied Materials Inc.
    • Authored and co-authored multiple semiconductor product development papers.
    • Prepared additional 12 patent applications (3 for SIORAH, 9 in Shanghai for MOCVD LED equipment).
  • Semiconductor Innovation
    • Key figure in developing state-of-the-art semiconductor equipment for CVD (Chemical Vapor Deposition) and ALD (Atomic Layer Deposition).
    • Pioneered Solid Delivery Systems for Al₂O₃ deposition products (2000s).
  • Renewable Energy Development
    • Worked on solar panel manufacturing systems, from glass prep to final serialized products.
  • Leadership Roles
    • Rose to Director of Engineering at Applied Materials, leading global R&D teams.
    • Co-founded SIORAH, Inc., spearheading semiconductor reactor system innovations.
    • Served as Senior Engineering Director in Shanghai for MOCVD LED startup (2011–2013), leading equipment to production stage.

Other Info

  • Born November 9, 1949, Sto. Domingo, Ilocos Sur.
  • Mapua Institute of Technology graduate, BSEE (1975).
  • Migrated to California, USA (1976), lived in the Bay Area for over 30 years.
  • Married twice: Estrella Ruelos Umotoy (1976, 2 children: Rhea – Biologist/Nurse; Ryan – Graphic Artist) and later Corazon Mendez Umotoy (2004).
  • Retired in 2015, aiming to enjoy family life after a long career in global engineering innovation.