US3667428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing systems
Assignee: Xerox Corp
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Filing: 1969-07-01
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Granted: 1972-06-06
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Expires: 1989-07-01
Abstract
Abstract A development system is provided wherein a movable developer loaded applicator surface is first doctored on the edges and corners of the surface to remove excess developer and prevent the accumulation of developer on the corners and is finally doctored with another doctoring surface along the entire applicator surface to provide a uniform distribution of developer on the surface which doctored applicator surface is brought into developing engagement with an image to be developed. Dry and liquid development techniques can be employed and the doctoring surfaces may be provided by doctor blades or rollers.
Inventors
- 👤 Richard E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:56
CPC Classifications
G; G03; G03D; G03D5/00; G03D5/06; G03D5/067; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0812; G03G15/10; G03G15/101; G03G15/102
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A development system comprising means to feed develoPer to an applicator surface, corner and edge doctoring means to provide a gross doctoring of the corners and edges of the applicator surface, principal doctoring means to provide a uniform doctoring along a line extending across the entire applicator surface, an imaging surface bearing an image to be developed, means to sequentially drive the applicator surface through the developer feed means, the corner and edge doctoring means, the principal doctoring means and position the applicator surface in developing configuration with the image bearing surface.
Claim 2
Dependent Claim
92 words
A development system comprising means to feed develoPer to an applicator surface, corner and edge doctoring means to provide a gross doctoring of the corners and edges of the applicator surface, principal doctoring means to provide a uniform doctoring along a line extending across the entire applicator surface, an imaging surface bearing an image to be developed, means to sequentially drive the applicator surface through the developer feed means, the corner and edge doctoring means, the principal doctoring means and position the applicator surface in developing configuration with the image bearing surface.
Claim 3
Dependent Claim
101 words
A development system comprising, a developer reservoir containing developer in feeding engagement with a rotatably mounted developer feed roller means; a rotatably mounted applicator roll means in developer transfer engagement with said feed roll means; corner and edge doctoring means having corner and edge doctoring surfaces in doctoring engagement with the corners and edges of said applicator roll means; principal doctoring means having a principal doctoring surface in doctoring engagement with said applicator roll means to provide uniform doctoring along a line extending across the entire applicator surface; and an image bearing surface in developing relationship with said applicator roll means.
Claim 4
Dependent Claim
101 words
A development system comprising, a developer reservoir containing developer in feeding engagement with a rotatably mounted developer feed roller means; a rotatably mounted applicator roll means in developer transfer engagement with said feed roll means; corner and edge doctoring means having corner and edge doctoring surfaces in doctoring engagement with the corners and edges of said applicator roll means; principal doctoring means having a principal doctoring surface in doctoring engagement with said applicator roll means to provide uniform doctoring along a line extending across the entire applicator surface; and an image bearing surface in developing relationship with said applicator roll means.
Claim 5
Dependent Claim
58 words
A development system comprising a path defining movable developer applicator surface and sequentially positioned along the applicator surface path a developer feed means, an edge and corner applicator surface doctoring means, principal applicator surface doctoring means, an imaging surface in developing engagement with the applicator surface and means to move the applicator surface along the means defining path.
Claim 6
Dependent Claim
58 words
A development system comprising a path defining movable developer applicator surface and sequentially positioned along the applicator surface path a developer feed means, an edge and corner applicator surface doctoring means, principal applicator surface doctoring means, an imaging surface in developing engagement with the applicator surface and means to move the applicator surface along the means defining path.
Claim 7
Dependent Claim
49 words
The system of claim 3 wherein the path defining movable developer applicator surface is a cylindrical roll, edge and corner doctoring means is provided by blades having doctoring surfaces which conform to the end profiles of the applicator roll and the principal doctoring surface means is a blade doctor.
Claim 8
Dependent Claim
19 words
The system of claim 4 wherein the applicator roll has a regular surface pattern of raised and depressed positions.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |