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:
Jun. 26, 2012
Filed:
May. 01, 2007
Allister R. Mcintyre, Newtownards, GB;
John Mccune Anderson, Holywood, GB;
Johnny Houston Anderson, Holywood, GB;
Allister R. McIntyre, Newtownards, GB;
John McCune Anderson, Holywood, GB;
Johnny Houston Anderson, Holywood, GB;
Heartsine Technologies Ltd., Belfast, GB;
Abstract
An H-bridge switching circuit for an automated external defibrillator comprises an SCR (D) in one of the high legs of the circuit and a control means (D-D) associated with the SCR which is operative to switch the SCR on automatically in response to a voltage change across the SCR corresponding to the switching device in the diagonally opposite leg of the H-bridge turning on. The control means comprises a capacitor (D) and the voltage on the capacitor changes when the diagonally opposite switching device turns on, the change in capacitor voltage lagging the change in voltage across the SCR and the SCR being turned on when the difference between the capacitor voltage and the voltage across the SCR exceeds a predetermined threshold.