US4054885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording device
Assignee: US Philips Corp
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Filing: 1970-09-15
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Granted: 1977-10-18
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Expires: 1990-09-15
Abstract
Abstract An electrostatic recording device in which an area on a record carrier is charged electrically. Electrodes are arranged on both sides of the carrier. The print electrodes arranged in groups on one side thereof serve to form the desirable charge image. The counter electrodes on the other side, serve to select the desirable print electrode group. The counter electrodes being arranged in spaced opposing relationship with portions of two groups of print electrodes. The print electrodes are arranged in even and odd groupings, with each alternating group set being electrically connected.
Inventors
- 👤 Ulf Rothgordt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:03
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/325; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
202 words
An electrographic recording system for recording on a record medium having a charge retentive surface, said system comprising: a plurality of arrays of recording electrodes, with each recording electrode mounted with an area thereof in close proximity to said charge retentive surface; circuit means interconnecting like-numbered recording electrodes of separated arrays to establish at least two electrically independent groups of arryas, with each array of each group separated from every other array of said group by at least one array of another group; a plurality of complementary electrodes mounted with an area of each in electrical cooperative relationship with said record medium, each complementary electrode being mounted adjacent to a single array of a group of arrays and spaced from all other arrays of said group by at least a portion of an array of another group; means for applying a first voltage of one polarity to any selected recording electrode; means for applying a second voltage of opposite polarity to at least one complementary electrode adjacent to the selected recording electrode, in coincidence with said first voltage and wherein the record medium is threaded between the recording electrodes and the complementary electrodes and is in intimate contact with the complementary electrodes.
Claim 2
Dependent Claim
202 words
An electrographic recording system for recording on a record medium having a charge retentive surface, said system comprising: a plurality of arrays of recording electrodes, with each recording electrode mounted with an area thereof in close proximity to said charge retentive surface; circuit means interconnecting like-numbered recording electrodes of separated arrays to establish at least two electrically independent groups of arryas, with each array of each group separated from every other array of said group by at least one array of another group; a plurality of complementary electrodes mounted with an area of each in electrical cooperative relationship with said record medium, each complementary electrode being mounted adjacent to a single array of a group of arrays and spaced from all other arrays of said group by at least a portion of an array of another group; means for applying a first voltage of one polarity to any selected recording electrode; means for applying a second voltage of opposite polarity to at least one complementary electrode adjacent to the selected recording electrode, in coincidence with said first voltage and wherein the record medium is threaded between the recording electrodes and the complementary electrodes and is in intimate contact with the complementary electrodes.
Claim 3
Dependent Claim
45 words
A recording system as described in claim 1 wherein the second voltage is applied to all complementary electrodes which are closer to the array containing the selected recording electrode than they are to any other array in the group of arrays containing the selected electrode.
Claim 4
Dependent Claim
26 words
The apparatus as described in claim 1 wherein said means for applying a first voltage and said means for applying a second voltage includes semiconductor components.
Claim 5
Dependent Claim
211 words
An electrographic recording system for recording on a record medium having a charge retentive surface said system comprising: a plurality of arrays of recording electrodes, with each recording electrode mounted with an area thereof in close proximity to said charge retentive surface; circuit means interconnecting like-numbered recording electrodes of separated arrays to establish at least two electrically independent groups of arrays, with each array of each group separated from ever other array of said group by at least one array of another group; a plurality of complementary electrodes mounted with an area of each in electrical cooperative relationship with said record medium, each complementary electrode being mounted adjacent to a single array of a group of arrays and spaced from all other arrays of said group by at least a portion of an array of another group; means for applying a first voltage of one polarity to any selected recording electrode; means for applying a second voltage of opposite polarity to at least one complementary electrode adjacent to the selected recording electrode, in coincidence with said first voltage and wherein the record medium has a conductive portion which is not held at ground potential, and the complementary electrodes are mounted in electrical contact with the conductive portion of the record medium.
Claim 6
Dependent Claim
211 words
An electrographic recording system for recording on a record medium having a charge retentive surface said system comprising: a plurality of arrays of recording electrodes, with each recording electrode mounted with an area thereof in close proximity to said charge retentive surface; circuit means interconnecting like-numbered recording electrodes of separated arrays to establish at least two electrically independent groups of arrays, with each array of each group separated from ever other array of said group by at least one array of another group; a plurality of complementary electrodes mounted with an area of each in electrical cooperative relationship with said record medium, each complementary electrode being mounted adjacent to a single array of a group of arrays and spaced from all other arrays of said group by at least a portion of an array of another group; means for applying a first voltage of one polarity to any selected recording electrode; means for applying a second voltage of opposite polarity to at least one complementary electrode adjacent to the selected recording electrode, in coincidence with said first voltage and wherein the record medium has a conductive portion which is not held at ground potential, and the complementary electrodes are mounted in electrical contact with the conductive portion of the record medium.
Claim 7
Dependent Claim
45 words
A recording system as described in claim 4 wherein the second voltage is applied to all complementary electrodes which are closer to the array containing the selected recording electrode than they are to any other array in the group of arrays containing the selected electrode.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |