国家/地区 中国（2）
IPC部 B（2）
IPC大类 B29（2）
IPC小类 C07D（2）
IPC
发明人
公开年
申请年
专利权人

Pod-type degradable temporary plugging ball useful in temporary plugging treatment of oil and gas wells in fracturing system, comprises degradable outer shell (comprising e.g. polymerized product of glycolide, lactide, polybutylene succinate prepolymer) and inner core.

LI H, ZHANG Y, SHANG L, HUANG B, LIU J, WANG Y, YANG X, JIANG Q

Electrochemical device used in electronic device, comprises positive electrode, cathode comprising cathode active material layer, isolation film, bonding layer, and lithium compound layer comprising lithium carbonate and/or lithium oxide.

ZHONG H