Patent US4064833A successfully refreshed from Google Patents.
US4064833A
Expired / Lapsed
US
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Toner density controller
Assignee: Pitney Bowes Inc
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Filing: 1976-11-08
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Granted: 1977-12-27
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Expires: 1996-11-08
Abstract
Abstract A toner density controller for determining the density of a development material in a magnetic brush assembly of an electrostatic copier is disclosed. Means is provided for imposing a charge on the toner density controller which is opposite in charge to that of the toner particles of the development material. In this way, the toner particles, particularly fines, are repelled from the toner density controller to eliminate interference with the functioning of the controller.
Inventors
- 👤 Julius Gluck
- 👤 Bheema Rao Vijayendran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:53
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; G03G15/0848; G03G15/0849; G03G15/0855
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
In a toner density controller for determining the density of a development material on a magnetic brush assembly of an electrostatic copier, the combination comprising: a. a sump; b. means disposed in said sump for mixing a development material and creating a triboelectric charge in the toner of the development material; c. a magnetic brush rotatably disposed within said sump; d. a housing having a window therein which is adjacent said sump; e. a light source supported by said housing and positioned to direct light through said window; f. a photocell located in said housing to receive light reflected by development material within said sump; g. an electrode supported by said housing and having an opening which is in registration with said window; h. means for supplying a charge to said electrode; and i. means for supplying a charge to said sump which is opposite in polarity to the charge supplied to said electrode.
Claim 2
Dependent Claim
154 words
In a toner density controller for determining the density of a development material on a magnetic brush assembly of an electrostatic copier, the combination comprising: a. a sump; b. means disposed in said sump for mixing a development material and creating a triboelectric charge in the toner of the development material; c. a magnetic brush rotatably disposed within said sump; d. a housing having a window therein which is adjacent said sump; e. a light source supported by said housing and positioned to direct light through said window; f. a photocell located in said housing to receive light reflected by development material within said sump; g. an electrode supported by said housing and having an opening which is in registration with said window; h. means for supplying a charge to said electrode; and i. means for supplying a charge to said sump which is opposite in polarity to the charge supplied to said electrode.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |