Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 4791412 | Magnetic article surveillance system and method A surveillance system based upon generation and detection of phase shifted harmonic signals from markers on articles or persons, responsive to transmission of a reference signal at a fundamental frequency in a detection zone, may be adversely affected by ... | 12/13/1988 |
| 4779076 | Deactivatable coded marker and magnetic article surveillance system A deactivatable coded marker for use in article surveillance systems has a core of soft magnetic material. An electrically conductive element at least partly surrounds the core, by reason of which the marker will generate a phase-shifted harmonic signal r... | 10/18/1988 |
| 4675657 | Electromagnetic surveillance system with improved signal processing Markers carried in an interrogation zone by articles to be monitored are subjected to an electromagnetic field varying in time at a fundamental frequency and respond by generating signals at harmonic frequencies of the fundamental frequency, characteristi... | 06/23/1987 |
| 4622542 | Magnetic article surveillance system, method and coded marker A surveillance system is based upon generation and detection of phase shifted harmonic signals responsive to transmission of a reference signal at a fundamental frequency in a detection zone. Phase shifted harmonic signals may be generated by markers comp... | 11/11/1986 |
