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. 02, 1977
Filed:
Aug. 18, 1975
Kjell Olow Olsson, Jarfalla, SW;
U.S. Philips Corporation, New York, NY (US);
Abstract
A transponder system with ensured synchronization for a railway signalling system, comprising an interrogating station, from which an interrogation signal is transmitted continuously, and a responder station which is energized in response to the interrogation signal and repeatedly retransmits a coded information reply signal to the interrogating station; synchronization is achieved, by starting each information transmission by means of a predetermined start signal generated in the interrogating station as a result of a predetermined bit sequence retransmitted from the responder station. In normal operation the bit sequence is generated immediately after the retransmission of a message or word and indicates the end of this message. At the start of operation when initially the inquiry station and reply unit have bad coupling to each other, the predetermined bit sequence is generated when the amplitude of the interrogating signal received in the responder station exceeds a certain threshold level for starting-up the system.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile