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:
Sep. 07, 1976
Filed:
Jun. 12, 1975
Applicant:
Inventor:
David James Martin, Leatherhead, EN;
Assignee:
Coal Industry (Patents) Limited, London, EN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
325-2 ; 325-4 ; 325 51 ;
Abstract
A telecommunication system uses a long main transmission line which extends from a base station and has repeaters along its length. A parallel line is divided into sections corresponding in length to the distance between repeaters. Selected sections are connected in parallel with the main line through switches which operate at about a 3 kHz frequency. The switching operation reduced alternations in the main signal and mitigates problems arising from standing waves.