US3790867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-intensifying device
Assignee: Panasonic Holdings Corp
•
Filing: 1973-02-16
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Granted: 1974-02-05
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Expires: 1993-02-16
Abstract
Abstract A light-intensifying device comprises a panel of integrated layers composed of a transparent base, a first transparent electrode layer, a photoconductive layer, a negative resistance layer, an electroluminescent layer, and a second transparent electrode. The device can prevent the halation appearing around the bright field of an output image.
Inventors
- 👤 S Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:52
CPC Classifications
H; H10; H10F; H10F55/00; H10F55/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A light-intensifying device as claimed in claim 1, wherein said electricity-to-light conversion layer consists essentially of an electroluminescent material.
Claim 2
Dependent Claim
32 words
A light-intensifying device as claimed in claim 1, wherein said negative resistance layer consists essentially of a thermistor layer comprised of a finely divided powder having a positive temperature coefficient of resistance.
Claim 3
Dependent Claim
19 words
A light-intensifying device as claimed in claim 1, wherein said light-to-electricity conversion layer consists essentially of a photoconductive material.
Claim 4
Dependent Claim
28 words
A light-intensifying device as claimed in claim 1, wherein said negative resistance layer has a heating element embedded therein for controlling the size of said critical voltage, Vc.
References Cited (Backward Citations)
US3365576A
Cited
US3740616A
Cited
US3564260A
Cited
US3573530A
Cited
US3548214A
Cited
US3590253A
Cited
US3711719A
Cited
US3699374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |