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Daejeon, South Korea

Elk Corporation

USPTO Granted Patents = 12

% Expired Patents = 33.3

EPO Patents = 1

Forward Citations = 82

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8 inventors (with patents filed for the assignee):

Yasushi Hanada (5 out of 5 patents)

Takashi Koyama (3 out of 117 patents)

Kwang Hyuk Bae (2 out of 2 patents)

4. Chul Woo Park (2 out of 30 patents)

5. Dong Hyuk Shin (2 out of 3 patents)

6. Nobuya Hayashi (1 out of 4 patents)

7. Alfred B Malmquist (1 out of 3 patents)

8. John G Freshwater (1 out of 1 patent)

9. Takashi Koyama (0 patent)

12 patents: Sort by Forward Citations

1. 10409331 - Cover glass for electronic device (2019-09-10),

2. 10365689 - Transparent cover for electronic device (2019-07-30),

3. 9463259 - Sterilizing apparatus and sterilizing method (2016-10-11),

4. 9320819 - Sterilization apparatus and method (2016-04-26),

5. 9173968 - Sterilization apparatus and sterilization method (2015-11-03),

6. 9044748 - Cartridge (2015-06-02),

7. 8894926 - Sterilization apparatus and sterilization method (2014-11-25),

8. 8815172 - Installation apparatus and sterilizing apparatus and method (2014-08-26),

9. 8012415 - Sterilization method and plasma sterilization apparatus (2011-09-06),

10. 7482747 - Flexible EL device (2009-01-27),

11. 7411143 - Flexible EL dome sheet and flexible EL dome sheet keypad using the same (2008-08-12),

12. 4559267 - Stick-down system for roofing (1985-12-17),

Elk Corporation is a leading manufacturer of roofing and building supply products. With decades of experience in the industry, we offer high quality materials and innovative solutions for residential and commercial projects. Our wide range of products includes roofing shingles, underlayments, ventilation systems, and more. We are dedicated to providing superior customer service and delivering exceptional products that exceed industry standards.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Sep 15 2026

12 Patents

#49 in Daejeon

#935 in South Korea

#48,036 in the World

Daejeon, South Korea

Elk Corporation

Forward Citations = 82

8 inventors:

Yasushi Hanada (5 out of 5 patents)

Takashi Koyama (3 out of 117 patents)

Kwang Hyuk Bae (2 out of 2 patents)

4. Chul Woo Park (2 out of 30 patents)

5. Dong Hyuk Shin (2 out of 3 patents)

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