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| Patents for G01V 15 - Tags attached to, or associated with, an object, in order to enable detection of the object (2,419) |
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| 03/04/1980 | CA1073076A1 Beat frequency interference rejection circuitry | | 01/16/1979 | US4135184 Electronic theft detection system for monitoring wide passageways | | 01/16/1979 | US4135183 Antipilferage system utilizing "figure-8" shaped field producing and detector coils | | 10/03/1978 | US4118693 Method and apparatus for producing uniform electromagnetic fields in an article detection system | | 09/26/1978 | US4117466 Beat frequency interference rejection circuit | | 04/11/1978 | USRE29610 Field strength uniformity control system | | 02/21/1978 | US4075618 Magnetic asymmetric antipilferage marker | | 02/14/1978 | US4074249 Magnetic detection means | | 01/03/1978 | US4066970 Pulse shaper for coaxial cable system | | 12/27/1977 | US4065753 Electromagnetically responsive projectile and system for detecting same | | 12/13/1977 | US4063229 Article surveillance | | 12/06/1977 | US4062010 Underground pipe detector | | 11/08/1977 | US4057081 Pipeline pigs | | 10/25/1977 | US4055796 Cable support and locator structure | | 06/07/1977 | US4028707 Antenna for underground pipe detector | | 04/05/1977 | US4016553 Article detection system with near field electromagnetic wave control | | 06/01/1976 | US3961322 Real time signal discrimination circuitry | | 03/30/1976 | US3947832 System for protecting persons underground from dangerous areas | | 02/03/1976 | US3936662 Interlocking system with a number of individual key elements |
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