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:
Jul. 06, 1976
Filed:
Sep. 08, 1975
Homer M Wilson, Houston, TX (US);
Petrolite Corporation, , US;
Abstract
A redundant intrinsic safety barrier with input and output terminals and circuit common connecting a plurality of signal lines. Input and output directors connect respectively to the input and output terminals. The directors are connected to each other and each of the directors provides dual unidirectional current paths from one of the input or output terminals to circuit common. Unidirectional current latching means in each current path provide a high impedance gap for voltage magnitudes below a predetermined value, and the latching means are self-latched into a low impedance bridge for current magnitudes above the predetermined value. Fused means in series with the input and output directors open the circuit therebetween when current in a certain time period exceeds the predetermined value by a certain selected amount.