US4580888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic development apparatus
Assignee: Xerox Corp
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Filing: 1984-05-24
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Granted: 1986-04-08
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Expires: 2004-05-24
Abstract
Abstract An apparatus in which a latent image recorded on a photoconductive surface is developed. The apparatus has a housing which forms, with the photoconductive surface, a substantially closed volume with the sealing edges of the housing being closely spaced from the photoconductive surface. A magnetic strip is mounted on at least one of the sealing edges of the housing. The magnetic sealing strip prevents the escape of carrier granules from the housing without the carrier granules adhering thereto.
Inventors
- 👤 Philip R. Thompson
- 👤 Tony Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:47
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0942; Y; Y10; Y10S; Y10S222/00; Y10S222/01
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
An apparatus for developing a latent image recorded on a photoconductive surface, including: means for transporting a developer material comprising at least magnetic carrier granules and toner particles into contact with the latent image; a housing defining a chamber having said transporting means disposed therein and forming with the photoconductive surface a substantially closed volume with sealing edges of said housing being closely spaced from the photoconductive surface on either side of said transporting means; a magnetic strip mounted on one of the sealing edges of said housing; and a stationary, cylindrical magnet disposed in the chamber of said housing and having a plurality of magnetic poles spaced circumferentially around the periphery thereof with the magnetic poles of said magnetic strip being positioned to deflect the magnetic field lines of said cylindrical magnet away from the sealing edge of said housing to prevent the escape of carrier granules from the chamber of said housing without the carrier granules adhering to said magnetic strip.
Claim 2
Independent Claim
163 words
An apparatus for developing a latent image recorded on a photoconductive surface, including: means for transporting a developer material comprising at least magnetic carrier granules and toner particles into contact with the latent image; a housing defining a chamber having said transporting means disposed therein and forming with the photoconductive surface a substantially closed volume with sealing edges of said housing being closely spaced from the photoconductive surface on either side of said transporting means; a magnetic strip mounted on one of the sealing edges of said housing; and a stationary, cylindrical magnet disposed in the chamber of said housing and having a plurality of magnetic poles spaced circumferentially around the periphery thereof with the magnetic poles of said magnetic strip being positioned to deflect the magnetic field lines of said cylindrical magnet away from the sealing edge of said housing to prevent the escape of carrier granules from the chamber of said housing without the carrier granules adhering to said magnetic strip.
Claim 3
Dependent Claim
23 words
An apparatus according to claim 1, wherein said magnetic means includes another magnetic strip mounted on the other sealing edge of said housing.
References Cited (Backward Citations)
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Cited
US3788275A
Cited
US3924944A
Cited
JPS55149962A
Cited
US4466728A
Cited
US4449810A
Cited
US4457257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |