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:
Nov. 10, 1987
Filed:
Mar. 06, 1985
Leon W Durivage, Marion, IA (US);
Ronald L Farrington, Cedar Rapids, IA (US);
Square D Company, Palatine, IL (US);
Abstract
An electrical distribution system having a plurality of dissimilar protective circuit breakers spaced upstream and downstream along the stream of the system includes a restraint signal interface circuit producing upstream restraint signals to the upstream breakers in response to received downstream restraint signals indicating the state of the downstream circuit breakers. The interface circuit pairs the downstream and upstream restraint signals to have the same electrical parameters and information, ground fault and short-time, content, while different pairs have different parameters and information content. A selection or logic circuit internal of the interface circuit distributes an active information state to all upstream restraint signals carrrying the same information as any one downstream restraint signal in an active information state.