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:
Sep. 12, 1978
Filed:
Oct. 07, 1977
Applicant:
Inventors:
George Brana, Bridgeport, CT (US);
John J Russell, Woodbury, CT (US);
Assignee:
Pitney-Bowes, Inc., Stamford, CT (US);
Primary Examiner:
Int. Cl.
CPC ...
G03G / ; G03G / ;
U.S. Cl.
CPC ...
252 / ; 427216 ; 428403 ;
Abstract
It has been found that unexpectedly high charge to mass ratios may be achieved in a development powder if the carrier particle of the development powder is treated with a perfluoroalkyl sulfonic acid. Treating carrier particles with a monolayer of such an acid has produced charge to mass ratios of 20 to 26 .times. 10.sup.-6 coulombs/gm. The acid concentration in of the solution used in this treatment has been found to be critical.