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:
Mar. 07, 1989
Filed:
Oct. 21, 1986
Hans Florin, Troisdorf Sieglar, DE;
Dynamit Nobel Aktiengesellschaft, Troisdorf, DE;
Abstract
A nonelectric delay detonator has means for allowing an ignition flame to be transmitted from an ignition transfer hose to a delay device. The delay device causes a secondary charge to detonate after a predetermined delay time. In order to obtain reproducibile delay times of the delay device, a check valve is arranged between one end of the ignition transfer hose and the delay device; this check valve being opened for a short time period due to the excess pressure in the hose and permitting the ignition flame to pass through. During deflagration of the delay device, the check valve is closed again so that the delay device burns within a closed system. In this manner, undefined pressure and gas losses are avoided.