US4035810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic interpositive method with electrostatic imaging
Assignee: Xerox Corp
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Filing: 1976-03-01
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Granted: 1977-07-12
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Expires: 1996-03-01
Abstract
Abstract An improved magnetic interpositive imaging method is provided by creating an electrostatic latent image in a photoconductive member comprising photoconductive material dispersed in a binder; developing by touchdown development said electrostatic latent image with toner comprising from about 10% to about 60% by volume hard magnetic material; fixing said toner to said photoconductive binder; magnetizing said fixed toner; and, transferring the magnetic signal from said magnetized, fixed toner by thermoremanent transfer of magnetization to a magnetizable recording medium.
Inventors
- 👤 Daniel F. Blossey
- 👤 Stephen F. Pond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:17
CPC Classifications
G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
98 words
An improved magnetic interpositive imaging method, comprising the steps of; (a) creating an electrostatic latent image in a photocondutive member comprising photocondutive material dispersed in a binder; (b) developing by touchdown development said electrostatic latent image with toner comprising from about 10% to about 60% by volume hard magnetic material; (c) fixing said toner to said photoconductive binder; (d) magnetizing said fixed toner to a spatial magnetization frequency of from about 4 to about 60 cycles per millimeter; and (e) transferring the magnetic signal from said magnetized, fixed toner by thermoremanent transfer magnetization to a magnetizable recording medium.
Claim 2
Dependent Claim
98 words
An improved magnetic interpositive imaging method, comprising the steps of; (a) creating an electrostatic latent image in a photocondutive member comprising photocondutive material dispersed in a binder; (b) developing by touchdown development said electrostatic latent image with toner comprising from about 10% to about 60% by volume hard magnetic material; (c) fixing said toner to said photoconductive binder; (d) magnetizing said fixed toner to a spatial magnetization frequency of from about 4 to about 60 cycles per millimeter; and (e) transferring the magnetic signal from said magnetized, fixed toner by thermoremanent transfer magnetization to a magnetizable recording medium.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said fixing step (c) comprises the step of applying pressure to said toner sufficient to calender the toner.
Claim 4
Dependent Claim
41 words
The method of claim 1 wherein step (d) is performed by heating said fixed toner to a temperature of at least the Curie point of the hard magnetic material therein and subjecting said hard magnetic material to a magnetic microfield pattern.
Claim 5
Dependent Claim
16 words
The method according to claim 3 wherein said heating is provided by a gaseous discharge lamp.
Claim 6
Dependent Claim
49 words
The method according to claim 1 wherein said hard magnetic material is selected from the group consisting of γ-Fe 2 O 3 , cobaloy, chromium dioxide, barium ferrite, lead ferrite, strontium ferrite, samarium cobalt alloys, alloys of aluminum, nickel and cobalt, cobalt ferrite, magnetite, manganese arsenide, and mixtures thereof.
Claim 7
Dependent Claim
17 words
The method according to claim 1 wherein said photoconductive material dispersed in a binder comprises zinc oxide.
Claim 8
Dependent Claim
46 words
The method according to claim 1 wherein step (e) comprises heating said magnetizable recording medium to at least its Curie point by exposure thereof to radiation from a gaseous discharge lamp and subjecting the magnetizable recording medium to the magnetic field of said magnetized, fixed toner.
Claim 9
Dependent Claim
77 words
Magnetic interpositive imaging apparatus comprising: (a) means for creating an electrostatic latent image; (b) touchdown development means for developing said electrostatic latent image with toner comprising hard magnetic material; (c) means for fixing said toner; (d) means for magnetizing said fixed toner at a spatial magnetization frequency of about 4 to about 60 cycles per millimeter; and (e) means for transferring magnetic signal from said magnetized, fixed toner by thermoremanent transfer magnetization to a magnetizable recording medium.
Claim 10
Dependent Claim
77 words
Magnetic interpositive imaging apparatus comprising: (a) means for creating an electrostatic latent image; (b) touchdown development means for developing said electrostatic latent image with toner comprising hard magnetic material; (c) means for fixing said toner; (d) means for magnetizing said fixed toner at a spatial magnetization frequency of about 4 to about 60 cycles per millimeter; and (e) means for transferring magnetic signal from said magnetized, fixed toner by thermoremanent transfer magnetization to a magnetizable recording medium.
Claim 11
Dependent Claim
35 words
The apparatus according to claim 8 wherein said means for magnetizing said fixed toner comprises means for magnetizing said fixed toner at a spatial magnetization frequency of about 4 to about 60 cycles per millimeter.
Claim 12
Dependent Claim
38 words
The apparatus according to claim 9 wherein said means for magnetizing said fixed toner comprises means for heating said toner to at least its Curie point and means for subjecting said heated toner to a magnetic microfield pattern.
Claim 13
Dependent Claim
18 words
The apparatus according to claim 10 wherein said means for heating said toner comprises a gaseous discharge lamp.
Claim 14
Dependent Claim
25 words
The apparatus according to claim 10 wherein the means for subjecting the heated toner to a magnetic microfield pattern comprises a magnetic microfield donor member.
Claim 15
Dependent Claim
58 words
The apparatus according to claim 8 wherein said means for transferring magnetic signals from said magnetized, fixed toner by thermoremanent transfer magnetization to a magnetizable recording medium comprises means for irradiating said magnetizable recording medium with a gaseous discharge lamp and means for subjecting said heated magnetizable recording medium to the magnetic field of said magnetized, fixed toner.
Claim 16
Dependent Claim
21 words
The apparatus according to claim 8 further including means for developing magnetic signals on said magnetizable recording medium with magnetic toner.
Claim 17
Dependent Claim
23 words
The apparatus according to claim 14 further including means for transferring said magnetic toner from said magnetizable recording medium to a receiving medium.
References Cited (Backward Citations)
US2970299A
Cited
US2857290A
Cited
US2793135A
Cited
US3612759A
Cited
US3611420A
Cited
US3804511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |