Grasspave²	Patent No:	5 250 340
	Gravelpave²	Patent No:	5 250 340
	Slopetame²	Patent No:	5 250 340
	Draincore²	Patent No:	5 848 856
	Rainstore³	Patent No:	724 847
	Surefoot4	Patent No:	5 250 340
	Beachrings²	Patent No:	4 896 993

Registered trademarks of Invisible Structures Pty Ltd:

	Grasspave²®
	Hydrogro®
	Gravelpave²®
	Slopetame²®
	Draincore²®
	Rainstore³®
	Airfield®

Warranty:

Invisible Structures Pty Ltd provides a 3 year limited product only warranty on all it's products.