US3916064A
Expired / Lapsed
US
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Developer material
Assignee: Xerox Corp
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Filing: 1974-01-21
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Granted: 1975-10-28
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Expires: 1994-01-21
Abstract
Abstract An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of large carrier particles, each of the carrier particles comprising a core material surrounded by a matrix material containing solid, finely divided particles having an average diameter less than about 10 microns wherein the solid, finely divided particles comprise at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, the metal and ammonium salts thereof.
Inventors
- 👤 Robert Warren Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:56
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1138; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998; Y10T428/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A PLURALITY OF LOOSE, FREELY MOVABLE CARRIER PARTICLES FOR ELECTROSTATOGRAPHIC DEVELOPER MIXTURES, EACH OF SAID PARTICLES COMPRISING A CORE SURROUNDED BY AN OUTER COATING OF MATRIX MATERIAL AND SOLID FINELY IVEDED PARTICLES O AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, ISOPHTHALIC ACID, TEREPHTHALIC ACID, AND THE METAL AND AMMONIUM SALTS THEREOF SUBSTANTIALLY UNIFORMLY DISPERED THROUGHOUT SAID OUTER COATING, SAID CARRIER PARTICLES HAVING AN AVERAGE DIAMETER BETWEEN ABOUT 30 AND ABOUT 1,000 MICRONS AND SAID SOLID FINELY DIVIDED PARTICLES OF SAID COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, ISOPHTHALIC ACID, TEREPHTHALIC ACID, AN THE METAL AND AMMONIUM SALTS THEREOF HAVING AN AVERAGE DIAMETER LESS THAN ABOUT 10 MICRONS.
Claim 2
Dependent Claim
114 words
A PLURALITY OF LOOSE, FREELY MOVABLE CARRIER PARTICLES FOR ELECTROSTATOGRAPHIC DEVELOPER MIXTURES, EACH OF SAID PARTICLES COMPRISING A CORE SURROUNDED BY AN OUTER COATING OF MATRIX MATERIAL AND SOLID FINELY IVEDED PARTICLES O AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, ISOPHTHALIC ACID, TEREPHTHALIC ACID, AND THE METAL AND AMMONIUM SALTS THEREOF SUBSTANTIALLY UNIFORMLY DISPERED THROUGHOUT SAID OUTER COATING, SAID CARRIER PARTICLES HAVING AN AVERAGE DIAMETER BETWEEN ABOUT 30 AND ABOUT 1,000 MICRONS AND SAID SOLID FINELY DIVIDED PARTICLES OF SAID COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, ISOPHTHALIC ACID, TEREPHTHALIC ACID, AN THE METAL AND AMMONIUM SALTS THEREOF HAVING AN AVERAGE DIAMETER LESS THAN ABOUT 10 MICRONS.
Claim 3
Dependent Claim
116 words
A plurality of loose, freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a glass core surrounded by an outer coating of matrix material and solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof substantially uniformly dispersed throughout said outer coating, said carrier particles having an average diameter between about 30 microns and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 4
Dependent Claim
116 words
A plurality of loose, freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a glass core surrounded by an outer coating of matrix material and solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof substantially uniformly dispersed throughout said outer coating, said carrier particles having an average diameter between about 30 microns and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 5
Dependent Claim
117 words
A plurality of loose freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a core surrounded by an outer coating of matrix material and solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof concentrated contiguous to the outer surface of said outer coating, said carrier particles having an average diameter between about 30 and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 6
Dependent Claim
117 words
A plurality of loose freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a core surrounded by an outer coating of matrix material and solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof concentrated contiguous to the outer surface of said outer coating, said carrier particles having an average diameter between about 30 and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 7
Dependent Claim
87 words
An electrostatographic freely movable carrier particle for developing electrostatic latent images, said carrier particle having an average diameter of between about 30 and about 1,000 microns, said carrier particle comprising a core overcoated with a matrix material and solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof substantially uniformly Dispersed throughout said matrix material, said solid finely divided particles having an average diameter less than about 10 microns.
Claim 8
Dependent Claim
87 words
An electrostatographic freely movable carrier particle for developing electrostatic latent images, said carrier particle having an average diameter of between about 30 and about 1,000 microns, said carrier particle comprising a core overcoated with a matrix material and solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof substantially uniformly Dispersed throughout said matrix material, said solid finely divided particles having an average diameter less than about 10 microns.
Claim 9
Dependent Claim
105 words
A plurality of loose, freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a core having distributed at the surface thereof solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof, said carrier particles having an avarage diameter of between about 30 and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 10
Dependent Claim
105 words
A plurality of loose, freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a core having distributed at the surface thereof solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof, said carrier particles having an avarage diameter of between about 30 and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 11
Dependent Claim
105 words
A plurality of loose, freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a core having substantially uniformly distributed throughout said core solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof, said carrier particles having an average diameter between about 30 and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 12
Dependent Claim
105 words
A plurality of loose, freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a core having substantially uniformly distributed throughout said core solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof, said carrier particles having an average diameter between about 30 and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 13
Dependent Claim
108 words
A plurality of loose freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a core and solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof concentrated contiguous to the outer surface of said core, said carrier particles having an average diameter between about 30 and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
Claim 14
Dependent Claim
108 words
A plurality of loose freely movable carrier particles for electrostatographic developer mixtures, each of said particles comprising a core and solid finely divided particles of at least one compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof concentrated contiguous to the outer surface of said core, said carrier particles having an average diameter between about 30 and about 1,000 microns, and said solid finely divided particles of said compound selected from the group consisting of phthalic acid, isophthalic acid, terephthalic acid, and the metal and ammonium salts thereof having an average diameter less than about 10 microns.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |