US4101320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic imaging method
Assignee: Xerox Corp
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Filing: 1974-12-30
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Granted: 1978-07-18
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Expires: 1994-12-30
Abstract
Abstract A magnetic imaging system is disclosed wherein an optical image is first reduced to a graphic image by employing a magnetizable marking material followed by magnetization of the graphic image and transfer of the imagewise pattern of magnetization to a magnetic substrate to provide a latent magnetic image. The latent magnetic image is utilized for the purpose of image duplicating by successive development and transfer steps or for electronic transmission of information. Improved latent magnetic images are provided by retoning the graphic image after magnetization and further magnetizing the retoned graphic image from which the latent image is produced. Also, polishing the redeveloped graphic image further improves the quality of the latent image.
Inventors
- 👤 Edward C. Sellers
- 👤 Chandler Malkani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:19
CPC Classifications
G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
An imaging method which comprises the steps of: (a) forming a grahic image with magnetizable marking materials; (b) magnetizing said graphic image; (c) further developing said graphic image by depositing magnetically attractable marking material on said magnetized image, without having previously fused said graphic image; (d) fixing said redeveloped image to a substrate; and, (e) subsequently polishing said fixed, redeveloped image and utilizing said redeveloped image to provide a latent magnetic image in a magnetic surface without transferring said redeveloped image to said magnetic surface.
Claim 2
Dependent Claim
85 words
An imaging method which comprises the steps of: (a) forming a grahic image with magnetizable marking materials; (b) magnetizing said graphic image; (c) further developing said graphic image by depositing magnetically attractable marking material on said magnetized image, without having previously fused said graphic image; (d) fixing said redeveloped image to a substrate; and, (e) subsequently polishing said fixed, redeveloped image and utilizing said redeveloped image to provide a latent magnetic image in a magnetic surface without transferring said redeveloped image to said magnetic surface.
Claim 3
Dependent Claim
40 words
The method of claim 1 wherein said latent image is provided by placing said redeveloped image in intimate contact with a uniformly magnetized magnetic surface and selectively demagnetizing said surface in the areas not in contact with the said image.
Claim 4
Dependent Claim
39 words
The method of claim 1 wherein said latent image is provided by magnetizing said fixed image, placing said magnetized image in intimate contact with said magnetic surface and selectively magnetizing said magnetic surface in areas contacted by said image.
Claim 5
Dependent Claim
20 words
The method of claim 3 further providing an applied excitation field across said image and magnetic surface during said contact.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein said graphic image is formed by means of the xerographic process.
Claim 7
Dependent Claim
28 words
The method of claim 5 wherein said graphic images are transferred from the photoconductive surface upon which it is initially formed to a paper substrate and fixed thereon.
Claim 8
Dependent Claim
27 words
The method of claim 1 further including the step of utilizing said latent image by means of electronically detecting and transmitting said image to a remote location.
Claim 9
Dependent Claim
45 words
The method of claim 1 wherein said latent image is utilized to provide a plurality of images by means of including the steps of toning said latent image with magnetically attractable and electrostatically chargeable toner particles and electrostatically transferring said developed image to another substrate.
Claim 10
Dependent Claim
24 words
The method of claim 1 wherein said magnetically attractable marking material is fixed to said graphic image by a fixative in said graphic image.
Claim 11
Dependent Claim
36 words
The method of claim 5 wherein said graphic image comprises a low load magnetic toner having a resinous fixative and said magnetically attractable toner is fixed to said graphic image by means of said resinous fixative.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |