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:
May. 24, 1977
Filed:
Dec. 31, 1975
Applicant:
Inventors:
Robert Lhommelet, Bois d'Arcy, FR;
Jean-Paul Raynal, Fontenay sous Bois, FR;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 51 ; 324 96 ; 324133 ; 3402 / ;
Abstract
Device for the automatic checking of operating thyristors making it possible to check clearly the good condition of thyristors. It comprises photocouplers connected with resistors, arranged in parallel with a group of thyristors. The outputs of the photocouplers are grouped two by two to form a differential information. Applications: Railway or underground railway equipment.