国家/地区 中国（4）
IPC部 F（4）
IPC大类 F16（4）
IPC小类 F16L（4）
IPC F16L009/14（4）
发明人
公开年 2023（4）
申请年 2022（4） 
专利权人

Polyethylene solid wall pipe has flocculent layer graphene and high density polyethylene layer that are provided with group of radiating holes connected with each other.

YUAN S

Expansion joint of catalytic cracking, has corrugated pipe and flange that are made of titanium material and inner wall of corrugate pipe is provided with anti-corrosion layer.

GU L, MIAO X, QIAN Y, XIA G

Aramid fiber winding composite pipeline for conveying hydrogen, has wearable layer located in inner layer of hydrogen blocking layer, where wearable layer is wearable plastic and is provided between core tube layer and outer protective layer.

WANG Y, MA Z, ZHAO M, LI Y, YU J, TANG Z

Preparing internal spiral polyvinyl chloride drainage pipe, comprises e.g. bending and spiraling steel wire, extruding, injecting into brushing mechanism, carrying out spiral groove processing, forming inner spiral groove, spraying, extruding, painting and performing preliminary drying.

LIU Z