Patent US4442985A successfully refreshed from Google Patents.
Patent US3720918A successfully refreshed from Google Patents.
Patent US3964033A successfully refreshed from Google Patents.
US3964033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrooptic storage device
Assignee: Panasonic Holdings Corp
•
Filing: 1974-12-02
•
Granted: 1976-06-15
•
Expires: 1994-12-02
Abstract
Abstract An electrooptic storage device having a transparent, ferroelectric ceramic plate, one pair of writing electrodes on opposite surfaces of the ferroelectric ceramic plate, respectively, and one pair of erasing electrodes on opposite edges, respectively of the ferroelectric ceramic plate, the writing electrodes each being a thermally sensitive transparent resistor layer. This device is a device capable of reversible image storage.
Inventors
- 👤 Kiyotaka Wasa
- 👤 Shunichiro Kawashima
- 👤 Shigeru Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:55
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/047; G03; G03G; G03G5/00; G03G5/153
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
An electrooptic storage device comprising a ferroelectric plate, one pair of writing electrodes on opposite surfaces of said ferroelectric plate, respectively, and one pair of erasing electrodes on opposite edges, respectively, of said ferroelectric plate, said writing electrodes comprising a thermally sensitive transparent resistor material having a switching characteristic at a switching temperature Ts and said switching temperature Ts being lower than the Curie temperature Tc of the material of said ferroelectric plate.
Claim 2
Dependent Claim
73 words
An electrooptic storage device comprising a ferroelectric plate, one pair of writing electrodes on opposite surfaces of said ferroelectric plate, respectively, and one pair of erasing electrodes on opposite edges, respectively, of said ferroelectric plate, said writing electrodes comprising a thermally sensitive transparent resistor material having a switching characteristic at a switching temperature Ts and said switching temperature Ts being lower than the Curie temperature Tc of the material of said ferroelectric plate.
Claim 3
Dependent Claim
21 words
An electrooptic storage device as claimed in claim 1, in which said ferroelectric plate is comprised of a transparent ferroelectric ceramic.
Claim 4
Dependent Claim
23 words
An electrooptic storage device as claimed in claim 1, in which said thermally sensitive resistor has a positive temperature coefficient of electrical resistance.
Claim 5
Dependent Claim
23 words
An electrooptic storage device as claimed in claim 1, in which said thermally sensitive resistor has a negative temperature coefficient of electrical resistance.
Claim 6
Dependent Claim
29 words
An electrooptic storage device as claimed in claim 1, further comprising an additional photosensitive layer between one of said surfaces of ferroelectric plate and one of said writing electrodes.
Claim 7
Dependent Claim
20 words
An electrooptic storage device as claimed in claim 5, in which said photosensitive layer is made of a photoconductive material.
Claim 8
Dependent Claim
36 words
An electrooptic storage device as claimed in claim 1, further comprising a pair of additional photosensitive layers, one said additional photosensitive layer being positioned between each surface of said ferroelectric plate and a corresponding writing electrode.
Claim 9
Dependent Claim
20 words
An electrooptic storage device as claimed in claim 7, in which said photosensitive layers are made of a photoconductive material.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |