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. 04, 1979
Filed:
Aug. 04, 1978
Yutaka Ebi, Kawasaki, JP;
Tositaka Hirata, Tokyo, JP;
Toshifumi Kato, Tokyo, JP;
Yohei Ikezu, Tokyo, JP;
Ricoh Company, Ltd., , JP;
Abstract
An electrostatic latent image is formed on a photoconductive or dielectric image carrier by a technique in which the image carrier is charged and exposed utilizing the photoconductivity, or by a technique in which the surface of the image carrier is directly and selectively charged with a stylus or a pin tube. The latent image is either directly developed or subjected to reversal development to form a positive or a negative visual image on the carrier. The direct development or reversal development may utilize one of dual toners which are charged to opposite polarities in a selective manner, or may employ a single component powder toner which is forcedly charged to a given polarity. the positive or negative visual image is electrostatically transferred onto a record sheet. The polarity of the voltage utilized during the transfer is switched depending on the polarity to which the toner which forms the visual image to be transferred is charged.