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:
Aug. 18, 1987
Filed:
Aug. 12, 1985
Paul D Frayer, Martinez, GA (US);
Rogers Corporation, Rogers, CT (US);
Abstract
A barrier for an electroluminescent lamp having a phosphor-particle-containing layer disposed between corresponding electrodes consists of an integral multilayer polymeric film. A first layer of barrier material is integrally bonded in face-to-face contact with the exposed outer surface of the lamp body and the material has a characteristic vapor transmission rate significantly below the vapor transmission rate of the material of the lamp body; a second layer of barrier material is integrally bonded in face-to-face contact with the first barrier layer and the material has a vapor transmission rate significantly greater than the vapor transmission rate of the material of the first barrier layer; and a third layer of barrier material is integrally bonded in face-to-face contact with the second barrier layer and the material has a vapor transmission rate significantly less than the vapor transmission rate of the material of the second barrier layer. The barrier layer materials are thus selected to provide alternating zones of hydrophobic and hydrophilic character, with interfacial boundaries between the layers, to restrict and delay permeation of moisture through the barrier into the lamp, the effective retardation of vapor transmission through the barrier into the lamp being greater than the sum of the retardation characteristics of the individual barrier layers.