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:
Nov. 01, 2005
Filed:
May. 21, 2004
Edward Balizer, Bethesda, MD (US);
Edward Balizer, Bethesda, MD (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A phase mixed thermoplastic polyurethane elastomer is provided for use in tranducers including underwater transducers, sonars and other electrostriction driven devices. The thermoplastic polyurethane elastomer includes an isocyanate, a butanediol, a polytetramethylene ether glycol, and a polyhydric alcohol. The thermoplastic polyurethane elastomer being made by adding the polytetramethylene ether glycol to isocyanate to form a mixture, then holding said mixture of the polytetramethylene ether glycol and isocyanate to a predetermined temperature for a predetermined time, degassing the mixture and sealing the mixture, measuring the percent free isocyanate to a predetermined molar ratio with the polytetramethylene ether glycol, chain extending the mixture into a first polymer with the butanediol and the polyhydric alcohol, adjusting the stoichiometry of said chain extender to a predetermined isocyanate index to avoid crosslinking, and postcuring the resin of the first polymer for a predetermined time and temperature.