US4136637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous contrast development system
Assignee: Xerox Corp
•
Filing: 1977-03-09
•
Granted: 1979-01-30
•
Expires: 1997-03-09
Abstract
Abstract A development apparatus in which the donor member has a pattern of depressed regions therein. The donor member moves developer material into contact with a sheet of support material disposed adjacent an electrostatic latent image recorded on a photoconductive surface. Inasmuch as the donor member has a pattern of depressed regions therein, the developer material is deposited on the sheet of support material in a half-tone pattern.
Inventors
- 👤 Christopher Snelling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:06
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
138 words
A development apparatus, including: a housing defining a chamber for storing a supply of developer material therein; and a donor member disposed in the chamber of said housing for advancing the developer material into the development zone, said donor member comprising a magnetic member, and a tubular member interfit telescopically over said magnetic member, said tubular member having at least two sets of plurality of grooves, one set of said plurality of grooves extending about the circumferential surface of said tubular member and being substantially equally spaced from one another in a direction extending along the longitudinal axis of said tubular member and the other set of said plurality of grooves extending substantially parallel to the longitudinal axis of said tubular member and being substantially equally spaced from one another about the circumferential surface of said tubular member.
Claim 2
Dependent Claim
138 words
A development apparatus, including: a housing defining a chamber for storing a supply of developer material therein; and a donor member disposed in the chamber of said housing for advancing the developer material into the development zone, said donor member comprising a magnetic member, and a tubular member interfit telescopically over said magnetic member, said tubular member having at least two sets of plurality of grooves, one set of said plurality of grooves extending about the circumferential surface of said tubular member and being substantially equally spaced from one another in a direction extending along the longitudinal axis of said tubular member and the other set of said plurality of grooves extending substantially parallel to the longitudinal axis of said tubular member and being substantially equally spaced from one another about the circumferential surface of said tubular member.
Claim 3
Dependent Claim
27 words
An apparatus as recited in claim 1, further including means for rotating said magnetic member relative to said tubular member with said tubular member being substantially stationary.
Claim 4
Dependent Claim
156 words
A development apparatus, including: a housing defining a chamber for storing a supply of developer material therein; a donor member disposed in the chamber of said housing for advancing the developer material into the development zone, said donor member comprising a magnetic member and a tubular member interfit telescopically over said magnetic member, said tubular member having at least two sets of plurality of grooves, one set of said plurality of grooves extending about the circumferential surface of said tubular member and being substantially equally spaced from one another in a direction extending along the longitudinal axis of said tubular member and the other set of said plurality of grooves extending substantially parallel to the longitudinal axis of said tubular member and being substantially equally spaced from one another about the circumferential surface of said tubular member, and means for rotating said tubular member relative to said magnetic member with said magnetic member being substantially stationary.
Claim 5
Dependent Claim
156 words
A development apparatus, including: a housing defining a chamber for storing a supply of developer material therein; a donor member disposed in the chamber of said housing for advancing the developer material into the development zone, said donor member comprising a magnetic member and a tubular member interfit telescopically over said magnetic member, said tubular member having at least two sets of plurality of grooves, one set of said plurality of grooves extending about the circumferential surface of said tubular member and being substantially equally spaced from one another in a direction extending along the longitudinal axis of said tubular member and the other set of said plurality of grooves extending substantially parallel to the longitudinal axis of said tubular member and being substantially equally spaced from one another about the circumferential surface of said tubular member, and means for rotating said tubular member relative to said magnetic member with said magnetic member being substantially stationary.
Claim 6
Dependent Claim
155 words
An electrostatographic printing machine for reproducing an original document on a sheet of support material, wherein the improved development apparatus includes: a housing defining a chamber for storing a supply of developer material therein; and a donor member disposed in the chamber of said housing for advancing the developer material into the development zone, said donor member comprising a magnetic member, and a tubular member interfit telescopically over said magnetic member, said tubular member having at least two sets of plurality of grooves, one set of said plurality of grooves extending about the circumferential surface of said tubular member and being substantially equally spaced from one another in a direction extending along the longitudinal axis of said tubular member, and the other set of said plurality of grooves extending substantially parallel to the longitudinal axis of said tubular member and being substantially equally spaced from one another about the circumferential surface of said tubular member.
Claim 7
Dependent Claim
155 words
An electrostatographic printing machine for reproducing an original document on a sheet of support material, wherein the improved development apparatus includes: a housing defining a chamber for storing a supply of developer material therein; and a donor member disposed in the chamber of said housing for advancing the developer material into the development zone, said donor member comprising a magnetic member, and a tubular member interfit telescopically over said magnetic member, said tubular member having at least two sets of plurality of grooves, one set of said plurality of grooves extending about the circumferential surface of said tubular member and being substantially equally spaced from one another in a direction extending along the longitudinal axis of said tubular member, and the other set of said plurality of grooves extending substantially parallel to the longitudinal axis of said tubular member and being substantially equally spaced from one another about the circumferential surface of said tubular member.
Claim 8
Dependent Claim
28 words
A printing machine as recited in claim 4, further including means for rotating said magnetic member relative to said tubular member with said tubular member being substantially stationary.
Claim 9
Dependent Claim
173 words
An electrostatographic printing machine for reproducing an original document on a sheet of support material, wherein the improved development apparatus includes: a housing defining a chamber for storing a supply of developer material therein; a donor member disposed in the chamber of said housing for advancing the developer material into the development zone, said donor member comprising a magnetic member and a tubular member interfit telescopically over said magnetic member, said tubular member having at least two sets of plurality of grooves, one set of said plurality of grooves extending about the circumferential surface of said tubular member and being substantially equally spaced from one another in a direction extending along the longitudinal axis of said tubular member, and the other set of said plurality of grooves extending substantially parallel to the longitudinal axis of said tubular member and being substantially equally spaced from one another about the circumferential surface of said tubular member; and means for rotating said tubular member relative to said magnetic member with said magnetic member being substantially stationary.
Claim 10
Dependent Claim
173 words
An electrostatographic printing machine for reproducing an original document on a sheet of support material, wherein the improved development apparatus includes: a housing defining a chamber for storing a supply of developer material therein; a donor member disposed in the chamber of said housing for advancing the developer material into the development zone, said donor member comprising a magnetic member and a tubular member interfit telescopically over said magnetic member, said tubular member having at least two sets of plurality of grooves, one set of said plurality of grooves extending about the circumferential surface of said tubular member and being substantially equally spaced from one another in a direction extending along the longitudinal axis of said tubular member, and the other set of said plurality of grooves extending substantially parallel to the longitudinal axis of said tubular member and being substantially equally spaced from one another about the circumferential surface of said tubular member; and means for rotating said tubular member relative to said magnetic member with said magnetic member being substantially stationary.
References Cited (Backward Citations)
US149706A
Cited
US3064622A
Cited
US3081737A
Cited
US3245381A
Cited
US3133834A
Cited
US3362380A
Cited
US3472676A
Cited
US3500793A
Cited
US3635195A
Cited
US3839992A
Cited
US3830199A
Cited
US3881927A
Cited
US3941084A
Cited
US3974554A
Cited
US3993024A
Cited
US4024838A
Cited
US4018187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |