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:
Feb. 06, 2001
Filed:
Sep. 02, 1999
Larry C. Warren, Huntsville, AL (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
A processing procedure for incorporating bismuth compounds into isocyanate cured hydroxy terminated binder propellants has been discovered. When added to the propellant formulation in ballistic modifier amounts (≧0.25%), bismuth salicylate and bismuth &bgr;-resorcylate significantly reduce the potlife to less than 1-hour. It was discovered that to maximize propellant potlife the temperature of the mixture at the time of the addition is critically important. The potlife of propellants containing bismuth compounds can be increased to greater than 15 hours at 70° F., when the temperature of the mixture at the addition step for bismuth, is lowered from the normal addition temperature of 150° F., to 60° F. Depending on the formulation and solids loading, the viscosity of the propellant at 60° F. is not greatly affected.