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:
Jul. 20, 1976
Filed:
Dec. 20, 1974
James R Olson, Rochester, NY (US);
Robert C Storey, Penfield, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A method for preparing a preconditioned dry electrographic developer comprising the steps of: a) intimately mixing together an unconsolidated mass of carrier particles, and an unconsolidated mass of resin based toner particles containing charge control agent in greater concentration than desired in the final developer, the concentration of said toner in the resulting mixture being less than desired in the final developer, such mixing being for a sufficient length of time and in such a way as to pack any pores of said carrier particles with toner, to scum the surfaces of said carrier particles with charge control agent, and to abrade the surfaces of said carrier particles; and b) introducing into and intimately mixing with said resulting mixture an additional quantity of resin based toner particles containing charge control agent in about the same concentration as desired in the free toner in the final developer, said additional quantity together with the free toner present after step (a) bringing the concentration of free toner in the final mixture up to that desired in the final developer. Mixing desirably is accomplished by tumbling in a rotating container.