은광용 박승태 박종구 2024-01-13T00:00:19Z 2024-01-13T00:00:19Z 1995-05-12 https://pubs.kist.re.kr/handle/201004/99781 입방정질화붕소의　제조방법 Patent 1995-05-12 1991-02-05 1931777 3-14386 JA 특허 한국과학기술연구원