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:
Apr. 07, 1992
Filed:
Jan. 11, 1991
Peter Groner, Denkendorf, DE;
Nokia Unterhaltungselektronik, Pforzheim, DE;
Abstract
In a method of recovering phosphor for picture tubes from phosphor sludge, the phosphor sludge is first subjected to a steam treatment, thereby causing substances adhering to the surface of the phosphor particles to pass into solution. The phosphor is then washed several times. Following wet screening, one then obtains a phosphor suspension that can be further processed just like virgin phosphor. The said method does not comprise any drying or calcining processes. The steam treatment causes the phosphor particles in the phosphor sludge to lose their tendency to cluster and form lumps, so that one obtains a high-yield suspension of very fine phosphor particles that can be further processed without any additional grinding or homogenization steps.