Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Plastics pipes having walls with lengthwise extending channels










Image Number 3 for United States Patent #4341392.

Plastic pipes comprising an inner and outer wall being interconnected by lengthwise extending connecting partitions, forming channels, the ends of the channels being each separately sealed by sealingly pressing the end walls of a channel to each other after these walls have been heated to a temperature surpassing the plasticizing temperature.








 
 
  Recently Added Patents
Method and system for distributing load by redirecting traffic
Systems and methods for restoring images
System for programming domestic appliances and method for programming assembly-line programmable domestic appliances
Polycarbonate resin composition and formed product thereof
Starch networks as absorbent or superabsorbent materials and their preparation by extrusion
Device and method for superimposing patterns on images in real time, particularly for guidance by location
System and methods for weak authentication data reinforcement
  Randomly Featured Patents
Method for vacuum baking indium in-situ
System and method for stabilizing and removing tissue
Fast flush load of LSSD SRL chains
Spline drive arrangements
Inexpensive diaper wetness monitoring system
Retractable magnifier with an electric lamp
Method of making long-term electrode for electrolytic processes
Safety device for a sliding panel driven by an electrical motor and method for implementing such a device
Flow cell for optical analysis of a fluid
Generation of haploid plants and improved plant breeding