- Il-Sug Chung and Alireza Taghizadeh, “Grating reflector” (EP 14163768.6)
- Il-Sug Chung and Alireza Taghizadeh, “Grating resonator” (EP 14163786.8)
- Il-Sug Chung and Qijiang Ran, “Mode selection laser,” WO2014056508 (publication number, Oct 12, 2012).
- Ole Hansen, Il-Sug Chung, Kresten Yvind, Thor Ansbæk, “Wavelength sweepable laser source,” EP2883291 (publication number, Aug 8, 2012), US9,337,618 (granted on May 10, 2016).
- Il-Sug Chung, “Laser device,” EP11189702.1 (filing date: July 4, 2011). US8,948,223 (granted on Feb 3, 2015).
- Il-Sug Chung, “Reflectivity-modulated grating mirror,” EP2525450 (Publication No., filing date: May 17, 2011). US8,917,752 (granted on Dec 23, 2014).
- Il-Sug Chung, “Hybrid vertical-cavity laser,” EP2396861 (granted on Dec 17, 2012), US9,184,562 (granted on Nov 11, 2015).
- Bong-Kyu Jeong, Il-Sug Chung, and Yong Tak Lee, “A portable mouse,” KR100891024 (granted, Sep 29, 2006).
- Il-Sug Chung and Yong Tak Lee, “Optical navigation sensor and optical module using the same,” KR100821359 (granted, Sep 14, 2006).
- Il-Sug Chung and Yong Tak Lee, “Method for manufacturing of resonant cavity enhanced photodetectors,” KR 100734565 (granted, Aug 19, 2005).
- Il-Sug Chung, Yong Tak Lee, Jae-Eun Kim, Hae Yong Park, “Method for forming a dielectric mirror and tuneable filter by use of a dielectric mirror to increase reflection rate,” KR 100837077 (granted, Feb 20, 2004).
- Hae Yong Park, Sang-Soon Oh, and Il-Sug Chung, “Microwave devices utilizing photonic band gap theory,” KR 100352454 (granted, May 3, 2000).