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For the Inventor, By the Inventor

San Jose, CA, United States of America

Wafermasters Incorporated


USPTO Granted Patents = 48

% Expired Patents = 64.6

Forward Citations = 465

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6 inventors (with patents filed for the assignee):

goldMedal Woo Sik Yoo (48 out of 52 patents)

silverMedal Kitaek Kang (9 out of 9 patents)

bronzeMedal Taro Yamazaki (3 out of 3 patents)

4.  Yoo Woo Sik (2 out of 2 patents)

5.  Takashi Fukada (1 out of 1 patent)

6.  Hiromitsu Kuribayashi (1 out of 4 patents)


Core Competencies:
Process Monitoring
Laser Beam Processing
Optical Emission Spectroscopy
Selective Heating
Gas-Assisted Processing
Thermal Annealing
Wafer Alignment
Plasma Processing
Batch Furnace
Defect-Free Processing
Wafer Mapping
Thermal Management

48 patents:

1. 7816152 - In situ, ex situ and inline process monitoring, optimization and fabrication (2010-10-19),
2. 7718554 - Focused laser beam processing (2010-05-18),
3. 7599048 - Optical emission spectroscopy process monitoring and material characterization (2009-10-06),
4. 7564547 - Spectroscopy system (2009-07-21),
5. 7507667 - Selective heating using flash anneal (2009-03-24),
6. 7440094 - Optical sample characterization system (2008-10-21),
7. 7397561 - Spectroscopy system (2008-07-08),
8. 7362426 - Raman and photoluminescence spectroscopy (2008-04-22),
9. 7358200 - Gas-assisted rapid thermal processing (2008-04-15),
10. 7344979 - High pressure treatment for improved grain growth and void reduction (2008-03-18),
11. 7276457 - Selective heating using flash anneal (2007-10-02),
12. 7262918 - Light beam conditioner (2007-08-28),
13. 7198677 - Low temperature wafer backside cleaning (2007-04-03),
14. 7194199 - Stacked annealing system (2007-03-20),
15. 7141513 - Integrated ashing and implant annealing method using ozone (2006-11-28),
Company Overview
Wafermasters Incorporated, based in San Jose, CA, specializes in advanced technologies for semiconductor manufacturing. The company focuses on laser beam processing, optical emission spectroscopy, and Raman spectroscopy, providing innovative solutions for wafer processing and analysis. Their expertise extends to gas-assisted thermal processing, plasma processing, and thermal evaporation systems, catering to the evolving needs of the semiconductor industry. Wafermasters is committed to enhancing precision and efficiency in wafer fabrication through cutting-edge techniques.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

48 Patents

#191 in San Jose, CA

#1,714 in California

#7,280 in US

#14,536 in the World

San Jose, CA (US)
San Jose, CA, United States of America

Wafermasters Incorporated

Forward Citations = 465

6 inventors:

goldMedal Woo Sik Yoo (48 out of 52 patents)

silverMedal Kitaek Kang (9 out of 9 patents)

bronzeMedal Taro Yamazaki (3 out of 3 patents)

4.  Yoo Woo Sik (2 out of 2 patents)

5.  Takashi Fukada (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Wafermasters Incorporated. Retrieved from https://idiyas.com/company/wafermasters

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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