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:
Apr. 19, 1977
Filed:
Jul. 09, 1975
Kjell Olow Olsson, Jarfalla, SW;
Bengt Georg Loggert, Solna, SW;
U.S. Philips Corporation, New York, NY (US);
Abstract
A responder system in which incoming frequency f.sub.0 is converted to a harmonic frequency, e.g. 2f.sub.0, by means of a non-linear element, for example a diode, which is connected between capacitance and inductance in two parallel-connected series resonant circuits, one of which is closely tuned to the incoming frequency f.sub.0 while the other is closely tuned to the selected harmonic frequency. Incoming frequency f.sub.0 is fed to the interconnected ends of the two resonant circuits, whereby both resonant circuits are excited at their respective resonance frequencies, and the harmonic frequency 2f.sub.0 is radiated back via a common antenna connected to the interconnected ends of the two series resonant circuits. When transmitting binary information by means of pulses at the harmonic frequency 2f.sub.0 the retransmitted pulses can be marked in certain pulse intervals by eliminating the resonance condition in the second resonant circuit (2f.sub.0) during a part of the interval, so that a dip will be produced in the retransmitted pulse, while in other intervals the pulse is retransmitted continuously.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile