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:
Sep. 06, 1983
Filed:
Jan. 19, 1981
Richard E Walker, Cadiz, OH (US);
James D Heckelman, Norwalk, OH (US);
Robert A Ziemke, Sandusky, OH (US);
Research Energy of Ohio, Inc., Cadiz, OH (US);
Abstract
A continuity checking system for detonating cord having four principle parts. The detonating cord has a fiber optic cord associated therewith to run from the blasting cap to a remote primer; a light return device is installed at the primer; a disposable testing head is installed at the end of the detonating cord adjacent the blasting cap; and a testing device is positioned a safe distance away from the disposable testing head. The testing head utilizes an LED with means for illuminating the end of the fiber optic cord, and a light sensitive device with means for sensing return light from the fiber optic cord. An electrical input signal, and an electrical output signal from the disposable testing head is communicated by electrical wires to the remote testing device. The remote testing device functions to test for a signal from the light sensitive device before supplying an input signal to the LED following which a time delay is initiated before the output signal from the light sensitive device is used to indicate continuity.