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. 28, 1989
Filed:
Jun. 13, 1988
William P Harper, South Killingly, CT (US);
Michael S Lunt, Abbington, CT (US);
Rogers Corporation, Rogers, CT (US);
Abstract
The invention provides electroluminescent lamps that contain light-emitting phosphors and covering layers which have unusual durability, light transmissivity and resistance to moisture using simple screen printing and doctor blade coating techniques. It is discovered that a liquid dispersion of thermoplastic polymer powder particles, e.g. predominantly of polyvinylidene fluoride, simultaneously: (a) can suspend electrical property additives, such as crystalline, hard, dense particles of generally spherical shape, uniformly in desired concentrations (b) while containing a useful concentration of any of a wide range of such particles, can be deposited by high shear transfer to a substrate in accurately controllable thickness and contour; (c) when so deposited can be fused into a continuous uniform film which has low absorptivity, e.g. of moisture and acts as a barrier film; (d) can, as one layer, be fused with other such layers, containing other electrical property additives, to form a monolithic electrical component; and, (e) in general, can meet all requirements for the making of electroluminescent lamps.