US3737874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive read only memory
Assignee: Bull HN Information Systems Italia SpA
•
Filing: 1970-12-03
•
Granted: 1973-06-05
•
Expires: 1990-12-03
Abstract
Abstract A capacitive read only memory which has a ground plane with a plurality of holes, a plurality of word conductors insulated from and disposed over one surface of the ground plane, and a plurality of sense conductors insulated from and disposed on the other surface of the ground plane. The word and sense conductors are substantially orthogonal to one another so as to define a plurality of conductor intersections, at least some of which correspond with the holes in the ground plane. An intersection position at which there is no hole identifies one of the binary storage states, while an intersection position corresponding with a hole in the ground plane identifies the other storage state.
Inventors
- 👤 G Hess
- 👤 J Kefalas
- 👤 R Macinnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:57
CPC Classifications
G; G11; G11C; G11C17/00; G11C17/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
A capacitive memory comprising: a. a conductive plane having a plurality of holes; b. a first and second insulating surface each juxtaposed with said conductive plane; c. a plurality of word conductive disposed on said first insulating surface; d. a plurality of sense cOnductors disposed on said second insulating surface; e. said sense conductors and said word conductors defining a plurality of intersections at least some of which correspond with said plurality of holes in said conductive plane; f. a number of conductive pads located on said word and said sense conductors, said pads being in alignment with said plurality of holes; and g. wherein the distance between the word conductors and the conductive plane is a multiple x of the distance between the sense conductors and the conductive plane as defined by the formula x b2/ac - (b-c)2 wherein a is the width of said sense conductors, b is the width of the conductive pads, c is the distance between said sense conductors and said conductive plane, and x defines the relationship that provides for a uniform capacitance per unit length.
Claim 2
Dependent Claim
182 words
A capacitive memory comprising: a. a conductive plane having a plurality of holes; b. a first and second insulating surface each juxtaposed with said conductive plane; c. a plurality of word conductive disposed on said first insulating surface; d. a plurality of sense cOnductors disposed on said second insulating surface; e. said sense conductors and said word conductors defining a plurality of intersections at least some of which correspond with said plurality of holes in said conductive plane; f. a number of conductive pads located on said word and said sense conductors, said pads being in alignment with said plurality of holes; and g. wherein the distance between the word conductors and the conductive plane is a multiple x of the distance between the sense conductors and the conductive plane as defined by the formula x b2/ac - (b-c)2 wherein a is the width of said sense conductors, b is the width of the conductive pads, c is the distance between said sense conductors and said conductive plane, and x defines the relationship that provides for a uniform capacitance per unit length.
Claim 3
Dependent Claim
28 words
A memory as defined in claim 1 wherein said plurality of holes of said conductive plane contains dielectric material, said dielectric material comprising part of said insulating surfaces.
Claim 4
Dependent Claim
19 words
The capacitive memory as defined in claim 1 wherein said first conductors are substantially orthogonal to said second conductors.
Claim 5
Dependent Claim
47 words
The capacitive memory as defined in claim 3 wherein said conductive pads have an enlarged substantially square surface area which is greater than the corresponding area of each conductor and said conductive plane has holes of substantially the same cross-sectional area as said conductive pad surface area.
References Cited (Backward Citations)
US3159820A
Cited
US3003143A
Cited
US3077591A
Cited
US3183490A
Cited
US3593319A
Cited
US3585368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |