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:
May. 01, 1979
Filed:
Jun. 09, 1975
Terence M Lawson, Aldgate, AU;
Blair D Howell, Lockleys, AU;
Research Laboratories of Australia Pty. Limited, Eastwood, AU;
Abstract
A method for pressure induced development of electrostatic latent images comprising forming an electrostatic latent image on a support member and subsequently placing the image bearing surface of the member in face contact with a receiving sheet, applying a dispersion to at least one of the contacting surfaces in a first state wherein the flow properties of the dispersion are non-Newtonian and the dispersion consists of a liquid phase and of a solid phase comprising flocculated electroscopic marking particles forming a matrix sufficiently strong to prevent extraction of individual electroscopic marking particles from the matrix by electrostatic attraction, using a pressure roller to apply to the dispersion a shear stress of sufficient magnitude to convert the dispersion to a second state wherein the flow properties of the dispersion become Newtonian and the solid phase is deflocculated in the liquid phase to allow individual electroscopic marking particles to deposit in accordance with the latent image, and separating the support member and the sheet whereby an image deposit is produced on the member and the sheet.