5 ms·
The method has even been patented! http://www.google.co.uk/patents/US5567541 http://www.google.co.uk/patents/US5567541
by JosephRedfern 12y ago
The method has even been patented! http://www.google.co.uk/patents/US5567541 http://www.google.co.uk/patents/US5567541
- mdda 12y agoThe patent was drafted very generally, but seems to focus on the volume (rather than elasticity) of the internal components. OTOH, it would be great if it were even more generally drafted, since its priority date is in 1995. 1995+17 = 2012, so the world is now wide open for innovation in this area, unimpeded by patents (IANAL).