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The following are patents on Pulse Induction type detectors.
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| Download |
Patent # |
Title |
Description |
 388K |
US3707672 |
Weapon Detector Utilyzing the Pulsed Field Technique to Detect Weapons on the Basis of Weapons Thickness |
| 1050K |
US4868504 |
Apparatus and Method for Locating Metal Objects and Minerals in the Ground with Return of Energy from Transmitter Coil to Power Supply |
Fisher Impulse PI, recycles power from the coil. |
| 495K |
US4894619 |
Impulse Induced Eddy Current Type Detector Using Plural Measuring Sequences in Detecting Metal Objects |
| 481K |
US5047718 |
Improving the Discrimination of an Impulse Technique Metal Detector by Correlating Responses Inside and Outside of a Cut-Off Peak Area |
| 678K |
US5414411 |
Pulse Induction Metal Detector |
White's, block level. |
| 2032K |
US5576624 |
Pulse Induction Time Domain Metal Detector |
Minelab, compare with US5506506 |
| 271K |
US6326790 |
Ground Piercing Metal Detector Having Range, Bearing, and Metal-Type Discrimination |
A PI probe |
| 1491K |
US6326791 |
Discrimination of Metallic Targets in Magnetically Susceptible Soil |
| 1408K |
US6452396 |
Method for Detecting the Metal Type of a Buried Metal Target |
Periscope |
| 1378K |
US6452397 |
Ground Piercing Metal Detector Method for Detecting the Location of a Buried Metal Object |
Periscope |
| 1430K |
US6456079 |
Circuit for Detecting the Metal Type of a Metal Target Object |
Periscope |
| 1830K |
US6529007 |
Temperature Compensation for Ground Piercing Metal Detector |
Periscope |
| 730K |
US6586938 |
Metal Detector Method and Apparatus |
| 258K |
US6636044 |
Ground Mineralization Rejecting Metal Detector (Receive Signal Weighting) |
Minelab, multi-width pulse |
| 706K |
US6653838 |
Ground Mineralization Rejecting Metal Detector (Transmit Signal) |
Minelab, multi-width pulse |
| 284K |
US6686742 |
Ground Mineralization Rejecting Metal Detector (Power Saving) |
Minelab, multi-width pulse |
| 1022K |
US6724305 |
Pulse Induction Silverware Detector |
| 466K |
US6853194 |
Electromagnetic Target Discriminator Sensor System and Method for Detecting and Identifying Metal Targets |
| 115K |
US6927577 |
Digital Nulling Pulse Inductive Metal Detector |
| 287K |
US6967574 |
Multi-Mode Electromagnetic Target Discriminator Sensor System and Method of Operation Thereof |
| 105K |
US7078906 |
Simultaneous Time-Domain and Frequency-Domain Metal Detector |
Combo PI & phase sampling |
| 156K |
US7148691 |
Step Current Inductive Antenna for Pulse Inductive Metal Detector |
| 89K |
US7474102 |
Rectangular-Wave Transmitting Metal Detector |
Minelab PI, see 7791345 |
| 128K |
US7652477 |
Multi-Frequency Metal Detector Having Constant Reactive Transmit Voltage Applied to a Transmit Coil |
Minelab |
| 117K |
US7710118 |
Resonant Pulse Induction Metal Detector that Transmits Energy from High Voltage Flyback Pulses |
Discriminating PI |
| 118K |
US7791345 |
Rectangular-Wave Transmitting Metal Detector |
Minelab PI, see 7474102 |
| 167K |
US7924012 |
Metal Detector Having Constant Reactive Transmit Voltage Applied to a Transmit Coil |
Minelab, GPZ TX |
| 97K |
US8106770 |
Metal Detector with Improved Magnetic Soil Response Cancellation |
Minelab, PI multisampling |
| 188K |
US8614576 |
Metal Detector Having Constant Reactive Transmit Voltage Applied to a Transmit Coil |
Minelab, GPZ TX |
| 1439K |
US9250348 |
Transmit Signal of a Metal Detector Controlled by Feedback Loops |
Minelab, CCPI-ish |
| 3827K |
US9348053 |
Metal Detector with at Least One Transmit/Receive Switch |
Minelab, PI TX methods |
| 164K |
US9366779 |
Signal Processing Technique for a Metal Detector |
Minelab, PI multisampling |
| 437K |
US9429674 |
Discrimination Method of a Metal Detector Based on a Time Constant Spectrum |
Minelab, PI |
| 664K |
US9547065 |
Method for Detecting Fast Time Constant Targets using a Metal Detector |
Minelab, PI TX cap canceling |
| 202K |
US9829598 |
Metal Detector |
Minelab, PI |
| 605K |
EP0654685 |
Arrangement and Method for Detecting Metal Objects |
PI with DD coil |
| 109K |
EP0732600 |
Active Impulse Magnetometer |
Looks more like a PI method |
| 516K |
GB2153077 |
Metal Detecting Apparatus |
Twin-coil PI, Crone & Crone (ETI project)
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| 1380K |
WO04008406 |
Pulse Induction Silverware Detector |
PCB-etched differential coils |