Process for magnetic image character recognition
US4517268A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1983 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | Sep 12, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/08711
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is an improved, simple, economical process for generating documents, such as personal checks, suitable for magnetic image character recognition, which process comprises generating such documents with conventional xerographic methods in a high speed electronic laser printing device, and wherein there is selected as the developer composition a magnetic toner containing from about 20 percent by weight to about 70 percent by weight of magnetite particles, and from about 30 percent by weight to about 80 percent by weight of toner resin particles of styrene copolymers, such as a styrene butadiene copolymer, a styrene n-butylmethacrylate copolymer, or polyesters, and wherein the carrier particles are comprised of ferrite cores, coated with various polymeric resinous compositions. There can also be included in the developer composition various additives such as collodial silica particles, and charge enhancing additives, and further conductive carbon black or insulating carbon black particles can be incorporated into the carrier polymeric resinous coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.