Patent US3929098A successfully refreshed from Google Patents.
US3929098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner loading for touchdown donor
Assignee: Xerox Corp
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Filing: 1973-11-28
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Granted: 1975-12-30
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Expires: 1993-11-28
Abstract
Abstract In an electrostatic development system, developer material in a sump comprises a mix of toner particles adhered to magnetic carrier particles. A transfer member, disposed in the trough of the sump, removes developer material in the form of a magnetic brush. A doner member, operatively associated with the transfer member and a photoreceptor having the electrostatic latent image to be developed, is biased whereby to strip toner particles from the carrier particles on said transfer member and to deliver said stripped toner particles to the latent image.
Inventors
- 👤 Alan J Liebman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:12
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0808; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0634; G03G2215/0636; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A DEVELOPMENT SYSTEM FOR DEVELOPING LATENT ELECTROSTATIC IMAGES CARRIED BY A PHOTORECEPTOR FOR AN ELECTROSTATIC PROCESSOR; SAID DEVELOPMENT SYSTEM COMPRISING THE COMBINATION OF A SUMP FOR STORING A SUPPLY OF DEVELOPER, SAID DEVELOPER INCLUDING FERROMAGNETIC CARRIER PARTICLES HAVING TONER PARTICLES TRIBOELECTRICALLY ATTRACTED THERETO; A ROTATABLE DONER MEMBER POSITIONED ADJACENT SAID PHOTORECEPTOR FOR APPLYING TONER PARTICLES TO SAID PHOTORECEPTOR IN CONFORMITY WITH SAID LATENT IMAGES; A MAGNETIC MEANS DISPOSED BETWEEN SAID SUMP AND SAID DONER MEMBER FOR LOADING SAID DONER MEMBER WITH TONER PARTICLES; AND MEANS COUPLED TO SAID DONER MEMBER AND SAID MAGNETIC MEANS FOR CREATING AN ELECTROSTATIC FIELD BETWEEN SAID MAGNETIC MEANSS AND SAID DONER MEMBER FOR STRIPPING THE TONER PARTICLES FROM THE CARRIER PARTICLES DURING THE LOADING OF SAID DONER MEMBER.
Claim 2
Dependent Claim
123 words
A DEVELOPMENT SYSTEM FOR DEVELOPING LATENT ELECTROSTATIC IMAGES CARRIED BY A PHOTORECEPTOR FOR AN ELECTROSTATIC PROCESSOR; SAID DEVELOPMENT SYSTEM COMPRISING THE COMBINATION OF A SUMP FOR STORING A SUPPLY OF DEVELOPER, SAID DEVELOPER INCLUDING FERROMAGNETIC CARRIER PARTICLES HAVING TONER PARTICLES TRIBOELECTRICALLY ATTRACTED THERETO; A ROTATABLE DONER MEMBER POSITIONED ADJACENT SAID PHOTORECEPTOR FOR APPLYING TONER PARTICLES TO SAID PHOTORECEPTOR IN CONFORMITY WITH SAID LATENT IMAGES; A MAGNETIC MEANS DISPOSED BETWEEN SAID SUMP AND SAID DONER MEMBER FOR LOADING SAID DONER MEMBER WITH TONER PARTICLES; AND MEANS COUPLED TO SAID DONER MEMBER AND SAID MAGNETIC MEANS FOR CREATING AN ELECTROSTATIC FIELD BETWEEN SAID MAGNETIC MEANSS AND SAID DONER MEMBER FOR STRIPPING THE TONER PARTICLES FROM THE CARRIER PARTICLES DURING THE LOADING OF SAID DONER MEMBER.
Claim 3
Dependent Claim
54 words
The development system of claim 1 wherein a rotatable magnetic means is located adjacent the surface of said doner member to magnetically attract any carrier particles carried by said donor member prior to said carrier particles being presented to said latent image, and means for removing said magnetic particles from said rotatable magnetic means.
Claim 4
Dependent Claim
39 words
The development system of claim 1 wherein the size distribution of said carrier particles is such that at least 85%, by volume, of all of the carrier particles in said sump are of a diameter less than 50 microns.
Claim 5
Dependent Claim
30 words
The development system of claim 3 wherein at least 85% by volume of all of said carrier particles in said sump are of a diameter between 10 and 50 microns.
Claim 6
Dependent Claim
111 words
A development system for developing latent electrostatic images carried by a photoreceptor of an electrostatic processor; said development system comprising the combination of a supply of developer including ferromagnetic carrier particles having toner particles triboelectrically attracted thereto, at least 85% by volume of all of said carrier particles having a diameter less than 50 microns; a doner member positioned adjacent said photoreceptor for developing said images with toner particles; and means disposed between said sump and said doner member for removing developer from said sump, stripping toner particles from the carrier particles of said removed developer and loading said toner member with a substantially uniform layer of said stripped toner particles.
Claim 7
Dependent Claim
111 words
A development system for developing latent electrostatic images carried by a photoreceptor of an electrostatic processor; said development system comprising the combination of a supply of developer including ferromagnetic carrier particles having toner particles triboelectrically attracted thereto, at least 85% by volume of all of said carrier particles having a diameter less than 50 microns; a doner member positioned adjacent said photoreceptor for developing said images with toner particles; and means disposed between said sump and said doner member for removing developer from said sump, stripping toner particles from the carrier particles of said removed developer and loading said toner member with a substantially uniform layer of said stripped toner particles.
Claim 8
Dependent Claim
30 words
The development system of claim 5 wherein at least 85% by volume of all of said carrier particles in said sump are of a diameter between 10 and 50 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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |