LandOfFree - US Patents - Listing for Pipes and tubular conduits,Longitudinally seamed,Permanent type seam

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Cylindrical rod and method for manufacturing the same

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Dual bias weld for continuous coiled tubing

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

External pipe reinforcing sleeve

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Highly tough ERW steel pipe with distinguished sour resistance

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Internally and externally enhanced wielded tube

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Method and apparatus for manufacturing a header pipe

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Method of preparing a steel pipe, an apparatus thereof and a ste

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Powder-filled welded steel tube and method for the continuous ma

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Square corner design for ductwork

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Stainless steel oil feeding pipe

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Super-high-strength line pipe excellent in low temperature...

Pipes and tubular conduits – Longitudinally seamed – Permanent type seam

Welded tube with excellent corrosion-resistant inner surface