Patent · US Expired

Carrier for reprography and production of this carrier

US4925762A · kind A · utility

10Cited by

9References

20Claims

0Family size

Assignee

BASF SE

Inventors

Werner Ostertag · Havelsee, DE
Erwin Czech · Biblis, DE
Franz-Ulrich Schmitt · Hannover, DE
Detlef Schulze-Hagenest · Molfsee, DE

Key dates

Filing date	Aug 17, 1988
Grant date	May 15, 1990
Priority date	—
Expiry date	Aug 17, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2991
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Carriers for a two-component dry developer are based on a ferrite or iron-containing core which carries a metal oxide layer consisting of reaction products deposited in the gas phase. The carriers according to the invention have abrasion-resistant metal oxide layers which permit electrostatic charging in both directions. By adjusting the thickness of the metal oxide layer, the electrical conductivity can be altered.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.