US3826573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recording and reproducing information in the form of electrical conductivity differences
Assignee: Battelle Memorial Institute Inc
•
Filing: 1971-06-16
•
Granted: 1974-07-30
•
Expires: 1991-06-16
Abstract
Abstract Information recording material sensitive to the action of activating radiation, at least part of the thickness of which. from the surface thereof, consists of a homogeneous dispersion of electrically conductive particles in an insulating binder essentially consisting of a substance or composition having swelling and/or solubility properties that can be modified through exposure to activating radiations. This material is able to yield a recording of information in the form of electrical conductivity differences after firstly being exposed to said radiations, modulated according to the information to be recorded, and secondly being treated to cause the exposed parts and the unexposed parts to swell differently. This material can be used, for instance, for reproducing documents, for taking Xray pictures and for taking pictures in electronic microscopy.
Inventors
- 👤 P Heinzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:27
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/026; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
19 words
A method according to claim 1, wherein the binder is made to swell under the action of A solvent.
Claim 2
Dependent Claim
18 words
A method according to claim 1, wherein the binder is made to swell under the action of heat.
Claim 3
Dependent Claim
65 words
A method according to claim 1 wherein the developing of the latent image consisting of regions of different conductivity into a visible image on the material is effected by selectively depositing a substance having a coloring which contrasts with the original coloring of the dispersion on certain parts of the surface of the material thereby to produce a positive or a negative of the image.
Claim 4
Dependent Claim
14 words
A method according to claim 4, in which the image is developed by electrolysis.
Claim 5
Dependent Claim
26 words
A method according to claim 5, which comprises using, as an electrolyte, an aqueous solution of at least one metallic salt having colored or black ions.
Claim 6
Dependent Claim
24 words
A method according to claim 4, in which the image is developed by electrophoresis of a suspension of electrically charged colored or black particles.
Claim 7
Dependent Claim
80 words
A method according to claim 6, which comprises using as a binder for the dispersion of conductive particles a substance capable of becoming adhesive by slight heating at least in the parts corresponding to the regions of the image on which the colored or black ions are deposited, and fixing the image by heating the surface of the material to a temperature slightly greater than that which is necessary to render the binder adhesive at least in these latter regions.
Claim 8
Dependent Claim
80 words
A method according to claim 7, which comprises using as a binder for the dispersion of conductive particles a substance capable of becoming adhesive by slight heating at least in the parts corresponding to the regions of the image on which the colored or black ions are deposited and fixing the image by heating the surface of the material to a temperature slightly greater than that which is necessary to render the binder adhesive at least in these latter regions.
Claim 9
Dependent Claim
47 words
A method according to claim 6, which comprises transferring the visible image which is materialized by the colored or black substance deposited by electrolysis on the surface of the material onto a receiving material and fixing the thus transferred image on the surface of the receiving material.
Claim 10
Dependent Claim
49 words
A method according to claim 7, which comprises using, as electrically charged particles, particles of a substance capable of becoming adhesive by slight heating, and fixing the image by heating the surface of the material to a temperature slightly greater than that needed to render said charged particles adhesive.
Claim 11
Dependent Claim
50 words
A method according to claim 7, which comprises transferring by electrostatic attraction the visible image which is materialized by the colored or black substance deposited by electrophoresis at the surface of the material onto a receiving material, and fixing the thus transferred image on the surface of the receiving material.
Claim 12
Dependent Claim
28 words
A method according to claim 1, which comprises transforming on the material the latent image, formed by differences of conductivity, into a latent image formed by electrostatic charges.
Claim 13
Dependent Claim
27 words
A method according to claim 13, which comprises effecting such transformation by subjecting the material, after irradiation thereof, to a corona discharge uniformly distributed over its surface.
Claim 14
Dependent Claim
20 words
A method according to claim 13, which comprises developing the latent image formed of electrostatic charges on the actual material.
Claim 15
Dependent Claim
30 words
A method according to claim 13, which comprises transferring the electrostatic image onto a receiving material and then developing the latent image formed of electrostatic charges on the receiving material.
Claim 16
Dependent Claim
39 words
A method according to claim 13, which comprises directly transferring onto a receiving material, through injection of electrostatic charges, the latent image formed of electrostatic charges from the latent image formed of different conductivity regions of the original material.
Claim 17
Dependent Claim
21 words
A method according to claim 17, in which the latent image formed of electrostatic charges is developed on the receiving material.
Claim 18
Dependent Claim
17 words
A method according to claim 15, in which the image is deveLoped by a dry electrostatic process.
Claim 19
Dependent Claim
14 words
A method according to claim 15, in which the image is developed by electrophoresis.
Claim 20
Dependent Claim
15 words
A method according to claim 1, which comprises using the material as a definitive document.
Claim 21
Dependent Claim
22 words
A method according to claim 1, which comprises using the material as a master for the preparation of a plurality of copies.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |