Patent US4074276A successfully refreshed from Google Patents.
US4074276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic imaging system using heat
Assignee: Xerox Corp
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Filing: 1976-05-26
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Granted: 1978-02-14
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Expires: 1996-05-26
Abstract
Abstract A magnetic imaging system wherein a magnetizable recording member comprising a substrate overcoated with a magnetic recording layer of magnetic particles dispersed in a binder is exposed to high energy light pulses of sufficient energy effective to cause or allow the removal of said magnetic recording layer in exposed regions thereof. Imagewise configured high energy light pulses result in the removal of imagewise configured portions of the magnetic recording layer. Removal of portions of the magnetic recording layer can occur either before or after magnetization of the magnetizable recording member and upon development with magnetic toner, a complementary magnetic toner image is formed and can be transferred to a receiving medium to form hard copy. The system is particularly applicable to the formation of a magnetic master which is used to form the same magnetic toner image numerous times.
Inventors
- 👤 Werner E. L. Haas
- 👤 Eugene C. Faucz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:02
CPC Classifications
G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
144 words
A magnetic imaging process, comprising: providing a magnetizable recording member comprising a substrate overcoated with a magnetic recording layer of magnetic particles dispersed in a binder; and exposing one of said substrate and said magnetic recording layer to light, thereby leaving said unexposed regions of said magnetic recording layer in said image configuration on the substrate in two locations at an energy level at about 0.05 to about 0.5 Joules per centimeter square for a period of time effective to at least weaken the binding force between said binder and said substrate to at least allow removal of said magnetic recording layer in regions thereof corresponding to exposed regions of said recording member upon contact of said magnetic recording layer with an adhesive member, thereby leaving said unexposed regions of said magnetic recording layer in said image configuration on the substrate in two locations.
Claim 2
Dependent Claim
144 words
A magnetic imaging process, comprising: providing a magnetizable recording member comprising a substrate overcoated with a magnetic recording layer of magnetic particles dispersed in a binder; and exposing one of said substrate and said magnetic recording layer to light, thereby leaving said unexposed regions of said magnetic recording layer in said image configuration on the substrate in two locations at an energy level at about 0.05 to about 0.5 Joules per centimeter square for a period of time effective to at least weaken the binding force between said binder and said substrate to at least allow removal of said magnetic recording layer in regions thereof corresponding to exposed regions of said recording member upon contact of said magnetic recording layer with an adhesive member, thereby leaving said unexposed regions of said magnetic recording layer in said image configuration on the substrate in two locations.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said light is provided by a laser.
Claim 4
Dependent Claim
51 words
The method of claim 1 further including the step of contacting said magnetic recording layer with an adhesive member and removing said adhesive member from contact with said recording layer whereby said adhesive member bears exposed portions of said magnetic recording layer which are thereby removed from said magnetic recording layer.
Claim 5
Dependent Claim
24 words
The process of claim 3 further including the step of magnetizing the exposed portions of said magnetic recording layer residing on said adhesive member.
Claim 6
Dependent Claim
27 words
The process of claim 4 further including the step of contacting said magnetized, exposed portions of magnetic recording layer residing on said adhesive member with magnetic toner.
Claim 7
Dependent Claim
18 words
The process of claim 5 further including the step of transferring said magnetic toner to a receiving medium.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein said receiving medium is paper.
Claim 9
Dependent Claim
118 words
A magnetic imaging process, comprising: a. providing a magnetizable recoding member comprising a substrate overcoated with a magnetic recording layer comprising magnetic particles dispersed in a binder; b. exposing one of said substrate and said magnetic recording layer to light, thereby leaving said unexposed regions of said magnetic recording layer in said image configuration on the substrate in two locations at an energy level of from about 0.05 to about 0.5 Joules per centimeter square for a period of time effective to remove the portions of said magnetic recording layer corresponding to exposed regions of said recording member, thereby leaving said unexposed regions of said magntic recording layer in said image configuration on the substrate in two locations.
Claim 10
Dependent Claim
118 words
A magnetic imaging process, comprising: a. providing a magnetizable recoding member comprising a substrate overcoated with a magnetic recording layer comprising magnetic particles dispersed in a binder; b. exposing one of said substrate and said magnetic recording layer to light, thereby leaving said unexposed regions of said magnetic recording layer in said image configuration on the substrate in two locations at an energy level of from about 0.05 to about 0.5 Joules per centimeter square for a period of time effective to remove the portions of said magnetic recording layer corresponding to exposed regions of said recording member, thereby leaving said unexposed regions of said magntic recording layer in said image configuration on the substrate in two locations.
Claim 11
Dependent Claim
20 words
The process of claim 8 wherein said substrate is transparent and said recording member is exposed through said transparent substrate.
Claim 12
Dependent Claim
26 words
The process of claim 8 wherein said substrate is opaque and wherein said magnetic recording layer of said recording member is directly exposed to said light.
Claim 13
Dependent Claim
13 words
The process of claim 8 wherein said light is provided by a laser.
Claim 14
Dependent Claim
24 words
The process of claim 8 further including the step of magnetizing said magnetic recording layer and contacting said magnetized recording layer with magnetic toner.
Claim 15
Dependent Claim
13 words
The method of claim 12 wherein said magnetizing step precedes such exposure step.
Claim 16
Dependent Claim
21 words
The process of claim 13 wherein said step of contacting said magnetized recording layer with magnetic toner precedes said exposure step.
Claim 17
Dependent Claim
22 words
The process of claim 12 further including the step of transferring said magnetic toner from said recording member to a receiving medium.
Claim 18
Dependent Claim
11 words
The process of claim 5 wherein said receiving medium is paper.
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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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |