Many times big corps do patent not to sue you or doing some patent trolling on you but to protect themselves against other patent troll entities. On Wed, Jul 29, 2015 at 9:47 AM, wrote: > > I just had to vent a bit and I think I would find kindred souls here. > > > > While searching for something related to MOSFETs, I came across the > > following patent: > > > > https://www.google.com/patents/US4454454 > > > > Apparently Motorola was granted a patent in 1984 on using MOSFETs in an > > H-bridge to drive a motor. > > > > This is ridiculous but what surprises me is that I have not heard about > this > > before. This seems to imply that, until 2004, Motorola could have sued > > anyone who used MOSFETs to drive a motor in an H-bridge configuration > > without paying Motorola a license fee. > > I suspect it would be too easily thrown out because of existing work usin= g > relays and bipolar transistors, as this is an obvious increment on the > state of the art. > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 int main() { char *a,*s,*q; printf(s=3D"int main() { char *a,*s,*q; printf(s=3D%s%s%s, q=3D%s%s%s%s,s,q,q,a=3D%s%s%s%s,q,q,q,a,a,q); }", q=3D"\"",s,q,q,a=3D"\\",q,q,q,a,a,q); } --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .