Patent US4018601A successfully refreshed from Google Patents.
US4018601A
Expired / Lapsed
US
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Electrostatographic magnetic brush imaging process employing carrier beads comprising high purity nickel
Assignee: Xerox Corp
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Filing: 1971-11-18
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Granted: 1977-04-19
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Expires: 1991-11-18
Abstract
Abstract Magnetic developer material comprising a carrier which comprises high purity nickel is disclosed. Electrophotographic processes employing said developer are also disclosed.
Inventors
- 👤 Robert J. Hagenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:53
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/107; G03G9/1075; G03G9/1087
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
An electrostatographic magnetic brush imaging process comprising the steps of forming an electrostatic latent image on a recording surface and developing said electrostatic latent image by contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely-divided toner particles having an average particle diameter between about 1 micron and about 30 microns, said toner particles comprising tetra-(hexyl-sulfonamido) phthalocyanine, and carrier beads comprising uncoated, substantially spherical, magnetic particles consisting of at least about 98.0 percent by weight purity of nickel having an average particle diameter between about 50 microns and about 1000 microns, whereby at least a portion of said finely-divided toner particles are attracted to and held on said recording surface in conformance to said electrostatic latent image.
Claim 2
Dependent Claim
119 words
An electrostatographic magnetic brush imaging process comprising the steps of forming an electrostatic latent image on a recording surface and developing said electrostatic latent image by contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely-divided toner particles having an average particle diameter between about 1 micron and about 30 microns, said toner particles comprising tetra-(hexyl-sulfonamido) phthalocyanine, and carrier beads comprising uncoated, substantially spherical, magnetic particles consisting of at least about 98.0 percent by weight purity of nickel having an average particle diameter between about 50 microns and about 1000 microns, whereby at least a portion of said finely-divided toner particles are attracted to and held on said recording surface in conformance to said electrostatic latent image.
Claim 3
Dependent Claim
118 words
An electrostatographic magnetic brush imaging process comprising the steps of forming an electrostatic latent image on a recording surface and developing said electrostatic latent image by contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely-divided toner particles having an average particle diameter between about 1 micron and about 30 microns, said toner particles comprising 1-amino-4-hydroxy-anthraquinone, and carrier beads comprising uncoated, substantially spherical, magnetic particles consisting of at least about 98.0 percent by weight purity of nickel having an average particle diameter between about 50 microns and about 1000 microns, whereby at least a portion of said finely-divided toner particles are attracted to and held on said recording surface in conformance to said electrostatic latent image.
Claim 4
Dependent Claim
118 words
An electrostatographic magnetic brush imaging process comprising the steps of forming an electrostatic latent image on a recording surface and developing said electrostatic latent image by contacting said electrostatic latent image with an electrostatographic developer mixture comprising finely-divided toner particles having an average particle diameter between about 1 micron and about 30 microns, said toner particles comprising 1-amino-4-hydroxy-anthraquinone, and carrier beads comprising uncoated, substantially spherical, magnetic particles consisting of at least about 98.0 percent by weight purity of nickel having an average particle diameter between about 50 microns and about 1000 microns, whereby at least a portion of said finely-divided toner particles are attracted to and held on said recording surface in conformance to 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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |