Resources Contact Us Home
Prefabricated portable tornado shelter

Image Number 3 for United States Patent #6151841.

An inexpensive, prefabricated portable tornado shelter is disclosed. The shelter is assembled from four equilateral triangular sides, a base frame, and a floor, to form a square pyramid-shaped enclosure with latched doors and PLEXIGLAS windows. The shelter allows constant air pressure equalization between its interior and exterior. The shelter is held firmly to the ground with four auger bolts.

  Recently Added Patents
Electrode tab for secondary battery and secondary battery using the same
Organic light-emitting display and method of manufacturing the same
Processing color and panchromatic pixels
In-vehicle electronic control apparatus having monitoring control circuit
Memristive junction with intrinsic rectifier
Semiconductor memory device and manufacturing method thereof
Method of manufacturing toner
  Randomly Featured Patents
Real time bank-centric universal payment system
Method and apparatus for supporting ventilation curtains in coal mines
Freeze monitoring device
Method and system for group call service
Collapsible play structures
Spring vice clamp with a soft grip
Separating whey components into high purity products by ion exchange
Process for coating electrically conductive substrates, water-based coatings and crosslinking agents containing masked NCO groups
Phenoxyalkylamine derivatives and preparation thereof
Multi-bit memory unit and fabrication method thereof