"Minelab's new patent. A detector with magnetic field".
That's what current VLF Induction Balance detectors do. They transmit a magnetic field into the ground through the transmitting portion of the coil. If metal is within that magnetic field, it causes a distortion or imbalance in that magnetic field. That imbalance, or secondary magnetic field is picked up by the receiving portion of the coil, analyzed and an audio, and/or visual ID is given. That basic process hasn't changed, or been improved greatly in the last 20+ yrs. Increases in depth have been mostly due to coil improvements.
If Minelab has improved that process by sending/driving that magnetic field deeper, it may be worthwhile. If they have improved the ability to more accurately analyze/ID those deeper return signals it may be worthwhile. At this point that remains to be seen. I'll keep an open mind, but I'm not going to let it keep me awake at night at this point. A patent is just a first step in securing the sole rights to any technology, or invention. Only a small percentage of patents come to fruition in marketable product.
I hope a breakthrough in detecting ability comes from it. Time will tell??? I personally have felt that improvements in the PI (Pulse Induction) realm would be the path to better detectors. The ability to accurately discriminate/ID is the direction I thought things would take?
" A detector with magnetic field" in of itself is nothing new.