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US3817868A Expired / Lapsed US ⏱️ 0.0 years remaining

Powder compositions for development of electrostatic images

Assignee: Agfa Gevaert NV
•
Filing: 1972-05-18
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Granted: 1974-06-18
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Expires: 1992-05-18
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Abstract

Abstract A DEVELOPING MATERIAL FOR USE IN THE DEVELOPMENT OF ELECTROSTATIC IMAGES COMPRISING TONER PARTICLES AND CARRIER PARTICLS IS DESCRIBED WHEREIN THE DEVELOPING MATERIAL INCORPORATES AT LEAST ONE SOLID HYDROPHOBIC BIVALENT OR TRIVALENT METAL SALT OF A HALF-ESTER OF A BRANCHED-CHAIN OR STRAIGHT-CHAIN ALIPHATIC DICARBOXYLIC ACID AND/OR AT LEAST ONE BIVALENT OR TRIVALENT METAL SALT OF A MONOESTER OR DIESTER OF A PHOSPHOROUS OXYACID. THE IMAGES OBTAINED BY MEANS OF THIS DEVELOPING MATERIAL HAVE AN IMPROVED IMAGE CONTRAST, SOLID AREA COVERAGE AND SURFACE SMOOTHNESS. THE TONER PARTICLES SHOW LESS TENDENCY TO CAKE AND AGGLOMERATE AND HAVE IMPROVED MECHANICAL STRENGTH. CLEANING OF THE IMAGING SURFACE BETWEEN USE AND RE-USE IS ALSO FACILITATED.

Inventors

  • 👤 Besauw J Van
  • 👤 Volder N De
  • 👤 Engeland J Van
  • 👤 A Poot

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 23:15
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/103

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-06-17 1977-12-17 1978-06-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-06-17 1981-12-17 1982-06-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-06-17 1985-12-17 1986-06-18 $7700.00 Window Closed / Lapsed

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