US3665856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing method using electric through-field to indelibly lodge particles
Assignee: Individual
•
Filing: 1970-02-24
•
Granted: 1972-05-30
•
Expires: 1990-02-24
Abstract
Abstract A printing method and apparatus is disclosed employing an electric through-field for effecting deposit of electroscopic particles on an electrically insulating particle receiving material. The through-field is controlled by a field plate disposed adjacent the particle receiving material to establish a force on the electroscopic particles capable of driving the particles into permanently lodged engagement in the interstices of the particle receiving material. The field plates may be of a letterpress type or may be an array of individual field poles controlled concurrently or sequentially.
Inventors
- 👤 William C Heller Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:23
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/34; G03G15/344; G03G15/348; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
142 words
A method for permanent marking, impregnating, printing and the like with finely divided electroscopic particles comprising disposing a substantially electrically insulating particle receiving material in a predetermined position, said material having a structural composition incorporating a myriad of distributed interstices, freely distributing finely divided electroscopic particles in the vicinity of one face of said material, said particles having a mean size on the order of 0.1 micron to be small enough to be driven into said interstices, and imposing an alternating polarity electric through-field to produce a peak field intensity in a range from about 1,000 volts per inch to the region where corona tends to form, said throughfield applying force on said particles and intercepting said material and terminating beyond said position to deposit said distributed particles at least partly into said interstices in an indelibly lodged relation to said material.
Claim 2
Independent Claim
142 words
A method for permanent marking, impregnating, printing and the like with finely divided electroscopic particles comprising disposing a substantially electrically insulating particle receiving material in a predetermined position, said material having a structural composition incorporating a myriad of distributed interstices, freely distributing finely divided electroscopic particles in the vicinity of one face of said material, said particles having a mean size on the order of 0.1 micron to be small enough to be driven into said interstices, and imposing an alternating polarity electric through-field to produce a peak field intensity in a range from about 1,000 volts per inch to the region where corona tends to form, said throughfield applying force on said particles and intercepting said material and terminating beyond said position to deposit said distributed particles at least partly into said interstices in an indelibly lodged relation to said material.
Claim 3
Dependent Claim
39 words
A method in accordance with claim 1 and including positioning an edged field plate adjacent said face to concentrate said through-field at said face and thereby facilitate formation of field strength sufficient to achieve indelible lodging of said particles.
Claim 4
Dependent Claim
28 words
A method in accordance with claim 1 wherein said electric through-Field is formed with a predetermined shape to lodge said particles in a pattern corresponding to said shape.
Claim 5
Dependent Claim
15 words
A method in accordance with claim 1 wherein said material is conventional porous copy paper.
Claim 6
Dependent Claim
21 words
A method in accordance with claim 4 wherein said particles range in size from about 0.01 micron to about 1 micron.
Claim 7
Dependent Claim
46 words
A method in accordance with claim 1 wherein said material is conventional porous copy paper, the size of said particles ranges from about 0.01 micron to about 1 micron and said alternating polarity electric through-field is applied at a frequency on the order of 15 KC.
Claim 8
Dependent Claim
32 words
A method in accordance with claim 1 wherein said material is conventional porous copy paper and said alternating polarity electric through-field is applied at a frequency on the order of 15 KC.
Claim 9
Dependent Claim
66 words
A method in accordance with claim 1 and wherein the step of disposing the particle receiving material includes locating the sheet of such material of substantially uniform thickness in a configuration assisting in defining an equi-potential plane and wherein said electric through-field is imposed with predetermined shape to provide deposit of said materials on said particle receiving material in a pattern corresponding to said predetermined shape.
Claim 10
Dependent Claim
26 words
A method in accordance with claim 8 and including positioning an edged field plate adjacent said face of said material to effect concentration of the through-field.
Claim 11
Dependent Claim
42 words
A method in accordance with claim 1 and wherein the step of imposing an electric through-field comprises selectively imposing a plurality of individually originating alternating polarity electric through-fields to deposit said particles in a pattern corresponding to the locations of said through-fields.
Claim 12
Dependent Claim
28 words
A method in accordance with claim 10 and wherein a number of electrical signals are concurrently applied to concurrently establish a corresponding number of individually originating electric through-fields.
Claim 13
Dependent Claim
25 words
A method in accordance with claim 10 and wherein electrical signals are sequentially applied to establish said individually originating electric through-fields in predetermined timed relation.
Claim 14
Dependent Claim
29 words
A method in accordance with claim 10 and including positioning localized field plate means adjacent said face of said material to effect individual concentration of each of the through-fields.
References Cited (Backward Citations)
US2716826A
Cited
US2940864A
Cited
US3096198A
Cited
US3280741A
Cited
US3079272A
Cited
US3207897A
Cited
US3261284A
Cited
US3225883A
Cited
US3218968A
Cited
US3218967A
Cited
US3202092A
Cited
US3253540A
Cited
US3247794A
Cited
US3316555A
Cited
US3389398A
Cited
US3355743A
Cited
US3276358A
Cited
US3279367A
Cited
US3273496A
Cited
US3294017A
Cited
US3526708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |