国家/地区 美国（2）
IPC部 C（2）
IPC大类 C01（2） D01（2）
IPC小类 C01B（2）
IPC C01B032/05（2）
发明人
公开年 2021（2）
申请年 2021（2）
专利权人

Producing graphene or carbon fiber involves extracting coal sample from location, performing spectral analysis on coal sample to detect hydrogen to carbon ratio of coal sample, concentration of contaminant in coal sample.

TARGETT M, LINDEMANN G W, ATKINS C A

Pitch-based ultrafine carbon fiber comprises specific nitrogen atom content measured by X-ray photoelectron spectroscopy, and has specified average fiber diameter and true density.

YAGI K, KOMURA S, HIRAKAWA R