The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1993
Filed:
Mar. 18, 1992
Ming R Lian, Clearwater, FL (US);
Fred W Herman, Tampa, FL (US);
Security Tag Systems, Inc., St. Petersburg, FL (US);
Abstract
A batteryless, portable, frequency divider includes a first resonant circuit that is resonant at a first frequency for receiving electromagnetic radiation at the first frequency; and a second resonant circuit that is resonant at a second frequency that is one-half the first frequency for transmitting electromagnetic radiation at the second frequency; and a circuit element electrically connecting the first resonant circuit to the second resonant circuit. The first resonant circuit is coupled magnetically to the second resonant circuit to transfer energy to the second resonant circuit at the first frequency in response to receipt by the first resonant circuit of electromagnetic radiation at the first frequency; and at least one of the first resonant circuit, the second resonant circuit and the circuit element includes an active element, such as a variable reactance element or a semiconductor switching device having gain, for causing the second resonant circuit to transmit electromagnetic radiation at the second frequency in response to the energy transferred from the first resonant circuit at the first frequency.