Patent US3940272A successfully refreshed from Google Patents.
US3940272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of developing an electrostatic latent image
Assignee: Xerox Corp
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Filing: 1974-01-04
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Granted: 1976-02-24
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Expires: 1994-01-04
Abstract
Abstract An apparatus for developing an electrostatic latent image. The apparatus is moved from an inoperative position spaced from the latent image to a position in operative communication therewith. After the latent image is developed, the apparatus is moved to the inoperative position thereof.
Inventors
- 👤 James R. Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:55
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A method of rendering visible an electrostatic latent image, including the steps of: activating a drive system for moving an assembly which transports developer mix to a developer roll being rotated by the drive system, whereby the reaction torque produced by the drive system pivots a developer housing having the transport assembly and developer roll located therein to dispose the developer roll adjacent the latent image in operative communication therewith; attracting toner particles from the developer roll to the latent image; de-activating the drive system to substantially remove the reaction torque being applied to the developer housing; and resiliently urging the developer housing to pivot disposing the developer roll in an inoperative position spaced from the latent image.
Claim 2
Independent Claim
118 words
A method of rendering visible an electrostatic latent image, including the steps of: activating a drive system for moving an assembly which transports developer mix to a developer roll being rotated by the drive system, whereby the reaction torque produced by the drive system pivots a developer housing having the transport assembly and developer roll located therein to dispose the developer roll adjacent the latent image in operative communication therewith; attracting toner particles from the developer roll to the latent image; de-activating the drive system to substantially remove the reaction torque being applied to the developer housing; and resiliently urging the developer housing to pivot disposing the developer roll in an inoperative position spaced from the latent image.
Claim 3
Independent Claim
143 words
A method of printing including the steps of: charging a photoconductive surface to a substantially uniform potential; exposing the charged photoconductive surface to a flowing light image of an original to be copied recording a latent image thereon; activating a drive system for moving an assembly which transports developer mix to a developer roll being rotated by the drive system, whereby the reaction torque produced by the drive system pivots a developer housing having the transport assembly and developer roll located therein to dispose the developer roll adjacent the photoconductive surface in operative communication therewith; attracting toner particles from the developer roll to the latent image; de-activating the drive system to substantially remove the reaction torque being applied to the developer housing; and resiliently urging the developer housing to pivot disposing the developer roll in an inoperative position spaced from the photoconductive surface.
Claim 4
Independent Claim
143 words
A method of printing including the steps of: charging a photoconductive surface to a substantially uniform potential; exposing the charged photoconductive surface to a flowing light image of an original to be copied recording a latent image thereon; activating a drive system for moving an assembly which transports developer mix to a developer roll being rotated by the drive system, whereby the reaction torque produced by the drive system pivots a developer housing having the transport assembly and developer roll located therein to dispose the developer roll adjacent the photoconductive surface in operative communication therewith; attracting toner particles from the developer roll to the latent image; de-activating the drive system to substantially remove the reaction torque being applied to the developer housing; and resiliently urging the developer housing to pivot disposing the developer roll in an inoperative position spaced from the photoconductive surface.
Claim 5
Dependent Claim
39 words
A method of printing as recited in claim 1, further including the steps of: transferring toner particles from the latent image to a sheet of support material; and fixing the toner particles permanently to the sheet of support material.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |