国家/地区 中国（4）
IPC部 B（4）
IPC大类 F16（4） C08（3） C09（3）
B29（2）
IPC小类 F16L（4） C08K（3） C08L（3）
C09D（3） B29D（2）
IPC F16L009/14（4）
发明人
公开年 2022（2） 2023（2）
申请年 2022（4）
专利权人

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

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

Modified polyethylene wearable composite pipe for water supply and drainage of municipal and building, has glass fiber line that is provided with multiple layers on outer layer pipe structure, inner tube body and outer layer pipe body fixedly connected with the inner layer pipe body.

LIN J

Preparing pipe material comprises cleaning mineral-inorganic composite materials, grinding, melting, casting and forming in combination with pipe mold by means of centrifugal casting, demolding and cooling, heating and densifying, and coating anti-corrosion coating.

WANG P