US3850663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose coated carriers
Assignee: Xerox Corp
•
Filing: 1972-11-17
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Granted: 1974-11-26
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Expires: 1992-11-17
Abstract
Abstract An electrostatographic developer mixture comprising finelydivided toner particles electrostatically clinging to the surface of carrier beads, each of the carrier beads comprising a core having a uniform coating thereon comprising a polymeric cellulose ester wherein said coating exhibits a volume resistivity of between about 1010 and about 1014 ohm-centimeters at 23*C. The process for employing the developer mixture in developing an electrostatic latent image is also disclosed.
Inventors
- 👤 R Hagenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:41
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1135
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
52 words
AN ELECTROSTATOGRAPHIC DEVELOPER MIXTURE COMPRISING FINELY DIVIDED TONER PARTICLES ELECTROSTATICALLY CLINGING TO THE SURFACE OF CARRIER BEADS, EACH OF SAID CARRIER BEADS COMPRISING A CORE HAVING A UNIFORM COATING THEREON COMPRISING A POLYMERIC CELLULOSE ESTER WHEREIN SAID COATING EXHIBITS A VOLUME RESISTIVITY OF BETWEEN ABOUT 10**10 AND ABOUT 10**14 OHMCENTIMETERS AT 23*C.
Claim 2
Dependent Claim
52 words
AN ELECTROSTATOGRAPHIC DEVELOPER MIXTURE COMPRISING FINELY DIVIDED TONER PARTICLES ELECTROSTATICALLY CLINGING TO THE SURFACE OF CARRIER BEADS, EACH OF SAID CARRIER BEADS COMPRISING A CORE HAVING A UNIFORM COATING THEREON COMPRISING A POLYMERIC CELLULOSE ESTER WHEREIN SAID COATING EXHIBITS A VOLUME RESISTIVITY OF BETWEEN ABOUT 10**10 AND ABOUT 10**14 OHMCENTIMETERS AT 23*C.
Claim 3
Dependent Claim
17 words
An electrostatographic developer mixture according to claim 1 wherein said polymeric cellulose ester is cellulose acetate butyrate.
Claim 4
Dependent Claim
15 words
An electrostatographic developer mixture according to claim 1 wherein the carrier bead core is glass.
Claim 5
Dependent Claim
15 words
An electrostatographic developer mixture according to claim 1 wherein the carrier bead core is flintshot.
Claim 6
Dependent Claim
107 words
An electrostatographic imaging process comprising the steps of forming an electrostatic latent image on a surface and developing said electrostatic latent image by contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier beads, each of said carrier beads comprising a core having a uniform coating thereon comprising a polymeric cellulose ester wherein said coating exhibits a volume resistivity of between about 1010 and about 1014 ohm-centimeters at 23*C., whereby at least a portion of said finely divided toner particles are attracted to and held on said surface in conformance with said electrostatic latent image.
Claim 7
Dependent Claim
107 words
An electrostatographic imaging process comprising the steps of forming an electrostatic latent image on a surface and developing said electrostatic latent image by contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier beads, each of said carrier beads comprising a core having a uniform coating thereon comprising a polymeric cellulose ester wherein said coating exhibits a volume resistivity of between about 1010 and about 1014 ohm-centimeters at 23*C., whereby at least a portion of said finely divided toner particles are attracted to and held on said surface in conformance with said electrostatic latent image.
Claim 8
Dependent Claim
106 words
An electrostatographic imaging process comprising the steps of forming an electrostatic latent image on a surface and developing said electrostatic latent image by contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier beads, each of said carrier beads comprising a core having a uniform coating thereon comprising cellulose acetate butyrate wherein said coating exhibits a volume resistivity of between about 1010 and about 1014 ohm-centimeters at 23*C., whereby at least a portion of said finely divided toner particles are attracted to and held on said surface in conformance with said electrostatic latent image.
Claim 9
Dependent Claim
106 words
An electrostatographic imaging process comprising the steps of forming an electrostatic latent image on a surface and developing said electrostatic latent image by contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier beads, each of said carrier beads comprising a core having a uniform coating thereon comprising cellulose acetate butyrate wherein said coating exhibits a volume resistivity of between about 1010 and about 1014 ohm-centimeters at 23*C., whereby at least a portion of said finely divided toner particles are attracted to and held on said surface in conformance with said electrostatic latent image.
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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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |