US3735156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible two-phase charge coupled devices
Assignee: AT&T Inc
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Filing: 1971-06-28
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Granted: 1973-05-22
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Expires: 1991-06-28
Abstract
Abstract Two-phase charge coupled devices are disclosed with no asymmetry in the structure to prevent reversing the direction of flow of charge carriers. The structure includes sets of two electrodes separated by wide gaps. An appropriate fixed charge in these gaps allows storage and transfer of charge carriers. The charge may be localized in the gap, or may be implanted uniformly over the surface of the device in the storage medium or in the insulating layer. Unidirectionality of transfer is achieved by a pulse train having an asymmetric phase relation. Reversing the phase relation reverses the directionality of charge.
Inventors
- 👤 R Krambeck
- 👤 C Sequin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:33
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/28; G11C19/282; H; H10; H10D; H10D44/00; H10D44/40; H10D44/45; H10D44/472; H10D44/474; H10D62/00; H10D62/10; H10D62/17; H10D62/213; H10D62/335
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A charge coupled device comprising a charge storage medium having fixed charge of a first polarity, an insulating layer covering at least a portion of one surface of said medium, a series of metal electrodes disposed upon said insulating layer so as to form a plurality of sets of two electrodes with a wider gap separating each set than the gap separating the two electrodes in a set, means for periodically biasing said sets of electrodes and the electrodes in the set sequentially comprising two conductors each connected to one electrode of each set for moving charge carriers in the storage medium in a direction essentially parallel to said surface, and a region of fixed charge included in the wider gap of a polarity opposite to that of the fixed charge in the storage medium, the magnitude of said region of fixed charge being such as to store charge carriers in the wider gap when both electrodes in the sets are not biased and to allow transfer of charge through said wider gap in a desired direction during the period when said bias is applied.
Claim 2
Dependent Claim
185 words
A charge coupled device comprising a charge storage medium having fixed charge of a first polarity, an insulating layer covering at least a portion of one surface of said medium, a series of metal electrodes disposed upon said insulating layer so as to form a plurality of sets of two electrodes with a wider gap separating each set than the gap separating the two electrodes in a set, means for periodically biasing said sets of electrodes and the electrodes in the set sequentially comprising two conductors each connected to one electrode of each set for moving charge carriers in the storage medium in a direction essentially parallel to said surface, and a region of fixed charge included in the wider gap of a polarity opposite to that of the fixed charge in the storage medium, the magnitude of said region of fixed charge being such as to store charge carriers in the wider gap when both electrodes in the sets are not biased and to allow transfer of charge through said wider gap in a desired direction during the period when said bias is applied.
Claim 3
Dependent Claim
39 words
The device according to claim 1 wherein the means for biasing the series of electrodes comprises means for supplying pulses to each of said conductors such that the pulses on the conductors overlap during a portion of the pulse.
Claim 4
Dependent Claim
18 words
The device according to claim 1 wherein said region of fixed charge is located in the storage medium.
Claim 5
Dependent Claim
18 words
The device according to claim 1 wherein said region of fixed charge is located in the insulating layer.
Claim 6
Dependent Claim
21 words
The device according to claim 1 wherein said region of fixed charge is confined to the area of the wider gap.
Claim 7
Dependent Claim
23 words
The device according to claim 1 wherein said region of fixed charge extends over essentially the entire area of the storage medium-insulator interface.
Claim 8
Dependent Claim
19 words
The device according to claim 1 wherein the minimum charge density of said region of fixed charge is 1011/cm2.
Claim 9
Dependent Claim
28 words
The device according to claim 1 wherein the electrodes in each set partially overlap, with a second insulating layer lying between the electrodes at said points of overlap.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |