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The following are patents on metal detector coils.
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| Download |
Patent # |
Title |
Description |
 301K |
US3549985 |
Metal Detector Device Having a Disk-ShapedHead for Housing a Coil System |
Seems to mostly cover plastics & fillers |
| 462K |
US3753185 |
Metal Detector Search Coil |
Bill Mahan, D-Tex |
| 276K |
US3882374 |
Transmitting-Receiving Coil Configuration |
IB |
| 1162K |
US4255711 |
Coil Arrangement for Search Head of a Metal Detector |
Compass, concentric IB |
| 624K |
US4276484 |
Method and Apparatus for Controlling Current in Inductive Loads Such as Large Diameter Coils |
Pulse method |
| 613K |
US4293816 |
Balanced Search Loop for Metal Detector |
White's concentric loop |
| 405K |
US4345208 |
Anti-falsing and Zero Nulling Search Head for a Metal Detector |
Daytona search coil |
| 405K |
US4552134 |
Equipment for Determining the Position of a Metal Body in a Medium With Low Electric Conductivity |
Particular IB coil arrangement |
| 735K |
US4862316 |
Static Charge Dissipating Housing for Metal Detector Search Loop Assembly |
White's concentric loop |
| 439K |
US4890064 |
Metal Detector Sensing Head with Reduced Eddy Current Coils |
Minelab, the use of litz wire in metal detector coils |
| 1142K |
US5038106 |
Detector of Metalliferous Objects Having Two Pairs of Receiving Loops Symmetrical and Orthogonal to a Driving Loop |
see US5039946 |
| 877K |
US5039946 |
Metalliferous Objects Detector Having a Pair of Angularly Positioned Driving Loops and a Pair of Parallel, Coaxial Receiving Loops |
see US5038106 |
| 614K |
US5245307 |
Search Coil Assembly for Electrically Conductive Object Detection |
| 411K |
US5498959 |
Metal Detector With Multipolar Windings Shaped So As To Eliminate the Neutralizing Effects When Several Metal Masses Are Passing Through Simulataneously |
Walk-through type coil arrangement |
| 392K |
US5557206 |
Apparatus & Method for Detecting a Weak Induced Magnetic Field by Means of Two Concentric Transmitter Loops |
Geophex, concentric IB coil |
| 429K |
US5859532 |
Method of and Measuring Arrangement for Metal Detection With a Coil Device Having Several Separately Controllable Regions |
Coil arrangements for walk-through type |
| 1216K |
US5863445 |
Etched Coil Unibody Digital Detector |
Handheld wand. |
| 56K |
US6690169 |
Interference Cancelling Metal Detector Including Electronic Selection of Effective Sensing Coil Arrangement |
Minelab |
| 779K |
US6791329 |
Portable Metal Detection and Classification System |
Coil methods for a powered rover |
| 154K |
US6822429 |
Inductive Sensor Arrangement Comprising Three Sense Coil Cooperating with Said Three Field Coils to Perform Three Field/Sense Coil Pairs and Method for Detecting of Ferrous Metal Objects |
Say that 3 times fast. |
| 96K |
US7075304 |
Variable Damping Induction Coil Metal Detection |
Uses a MOSFET for the damping resistor |
| 98K |
US7157913 |
Re-Configurable Induction Coil for Metal Detector |
Carl V. Nelson, PI flip-coil |
| 147K |
US7176691 |
Switched Coil Receiver Antenna for Metal Detector |
Carl V. Nelson, PI flip-coil |
| 61K |
US7656153 |
Metal Detector with Improved Receiver Coil |
Allan Westersten, PI flip-coil |
| 88K |
US7994789 |
Dual-Field Search Coil for Pulse Induction Metal Detectors |
White's TDI |
| 1587K |
US9557390 |
Noise Reduction Circuitry for a Metal Detector |
Minelab, primarily describes the Go-Find coil |
| 189K |
US11454736 |
Metal Detector |
Minelab, Coil compensation |
| 256K |
US11474274 |
Metal Detector |
Minelab, Coil compensation |
| 170K |
US11658416 |
Antenna of a Metal Detector |
Minelab, twisted flat spiral coil |
| 465K |
EP0249110 |
Sensors for Metal Detectors |
Some various coil arrangements |
| 80K |
EP0764856 |
Sensor for a Metal Detector |
Several IB coil arrangements |
| 552K |
WO08703380 |
Metal Detector Sensing Head with Reduced Eddy Current Coils |
Minelab, same as US4890064 |