US3713819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic imaging and development using metal oxide carrier particles
Assignee: Xerox Corp
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Filing: 1970-11-30
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Granted: 1973-01-30
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Expires: 1990-11-30
Abstract
Abstract A xerographic carrier bead material for use in developing electrostatic latent images comprising a glass composition of from about 10 to about 40 parts oxides of silicon, from about 5 to about 50 parts oxides of barium, and oxides of metals selected from the group consisting of titanium, lead and mixtures thereof.
Inventors
- 👤 R Hagenbach
- 👤 M Lenhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:54
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G9/00; G03G9/08; G03G9/10; G03G9/103; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
228 words
A method of forming a visible image comprising the steps of: a. forming an electrostatic latent image on a surface; b. contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely divided electroscopic toner particles having an average particle size less than about 30 microns electrostatically adhering to the surface of substantially homogeneous glass carrier particles having an average particle size between about 30 microns and about 1,000 microns, each of said toner particles comprising a resin and a colorant selected from the group consisting of dyes and pigments and each of said homogeneous glass carrier particles having a specific gravity between about 3 and about 6 and consisting essentially of from about 10 percent to about 40 percent by weight of oxides of silicon, from about 4 percent to about 50 percent by weight of oxides of barium, from about 15 percent to about 40 percent by weight of oxides of titanium, less than about 45 percent by weight of oxides of lead, less than about 4.5 percent by weight of oxides of calcium and less than about 5 percent by weight of oxides of metals selected from the group consisting of sodium, potassium, lithium and mixtures thereof; c. until at least a portion of said finely divided toner particles are attracted to and held on said surface in conformance to said electrostatic latent image.
Claim 2
Independent Claim
228 words
A method of forming a visible image comprising the steps of: a. forming an electrostatic latent image on a surface; b. contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely divided electroscopic toner particles having an average particle size less than about 30 microns electrostatically adhering to the surface of substantially homogeneous glass carrier particles having an average particle size between about 30 microns and about 1,000 microns, each of said toner particles comprising a resin and a colorant selected from the group consisting of dyes and pigments and each of said homogeneous glass carrier particles having a specific gravity between about 3 and about 6 and consisting essentially of from about 10 percent to about 40 percent by weight of oxides of silicon, from about 4 percent to about 50 percent by weight of oxides of barium, from about 15 percent to about 40 percent by weight of oxides of titanium, less than about 45 percent by weight of oxides of lead, less than about 4.5 percent by weight of oxides of calcium and less than about 5 percent by weight of oxides of metals selected from the group consisting of sodium, potassium, lithium and mixtures thereof; c. until at least a portion of said finely divided toner particles are attracted to and held on said surface in conformance to said electrostatic latent image.
Claim 3
Dependent Claim
119 words
A method of forming a visible image according to claim 1 wherein said glass carrier particles comprise from about 11 percent to about 13 percent by weight of oxides of silicon, from about 43 percent to about 48 percent by weight of oxides of barium, from about 34 percent to about 37 percent by weight of oxides of titanium, less than about 45 percent by weight of oxides of lead, less than about 4.5 percent by weight of oxides of calcium, from about 0.5 percent to about 1.5 percent by weight of oxides of boron and less than about 5 percent by weight of oxides of metals selected from the group consisting of sodium, potassium, lithium and mixtures thereof.
Claim 4
Dependent Claim
107 words
A method of forming a visible image according to claim 1 wherein said glass carrier particles comprise from about 30 percent to about 32 percent by weight of oxides of silicon, from about 4 percent to about 6 percent by weight of oxides of barium from about 16 to about 20 percent by weight of oxides of titanium, less than about 45 percent by weight of oxides of calcium, from about 2 percent from about 4 percent by weight of oxides of zirconium and less than about 5 percent by weight of oxides of metals selected from the group consisting of sodium, potassium, lithium and mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |