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. 29, 2000
Filed:
May. 22, 1998
Gerard McGoogan, Slamannan, GB;
Diagnostic Instruments Ltd., Livingston, GB;
Abstract
An intrinsically safe circuit for use in a hazardous environment includes a plurality of circuit sectors (1, 2) which are substantially isolated physically from one another by an electrical insulator, such as air, and are electrically connected, directly or indirectly, so as to define at lease one power transfer path (P1) between each circuit sector (1) and the other circuit sector (2) ; and power limiting means such as resistors (R1, R2) provided in each power transfer path between the connected circuit sectors for limiting the maximum power transfer value therebetween to a value less than a predetermined threshold value at which combustion in said hazardous environment is initiated. The circuit sectors (1, 2) having at least one power transfer path (P1) defined therebetween may have different sparking voltages, in which case voltage clamping means such as Zener diodes (Z1, Z2) is provided in each power transfer path between the two circuit sectors having different sparking voltages, for reducing the maximum voltage which may be applied by one of the two circuit sectors to the other.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile