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US5091765A
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Photoconductive cell with zinc oxide tetrapod crystals
Assignee: Panasonic Holdings Corp
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Filing: 1991-04-03
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Granted: 1992-02-25
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Expires: 2011-04-03
Abstract
Abstract A photoconductive cell comprises a photodetector section which consists of an aggregate of tetrapod-like zinc oxide whiskers. Each whisker consists of a core and needle-shaped crystals extending in four different directions from the core. Since this novel tetrapod-like zinc oxide whisker consists of single crystal zinc oxide, it suffers less deterioration. In addition, since the single crystals are transparent and an aggregate thereof has a high porosity, light tends to enter deep portions of the cell so that it exhibits high sensitivity.
Inventors
- 👤 Minoru Yoshinaka
- 👤 Eizou Asakura
- 👤 Mitsumasa Oku
- 👤 Motoi Kitano
- 👤 Hideyuki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:31
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/10; H10F77/16; C; C30; C30B; C30B25/00; C30B25/005; C30B29/00; C30B29/10; C30B29/16; H10F10/00; H10F10/10; H10F30/00; H10F30/10; H10F71/00; H10F71/125; H10F77/12; H10F77/123; H10F77/14; H10F77/20; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y02E10/543
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
A photoconductive cell comprising a photodetector section which comprises an aggregate containing tetrapod-like zinc oxide whiskers each consisting of a core and four needle-shaped crystals extending in four different directions from the core and each having a diameter of from 0.7 to 14 μm at a root portion of the crystal and a length from the root to a tip end of the crystal of from 3 to 200 μm.
Claim 2
Dependent Claim
70 words
A photoconductive cell comprising a photodetector section which comprises an aggregate containing tetrapod-like zinc oxide whiskers each consisting of a core and four needle-shaped crystals extending in four different directions from the core and each having a diameter of from 0.7 to 14 μm at a root portion of the crystal and a length from the root to a tip end of the crystal of from 3 to 200 μm.
Claim 3
Dependent Claim
44 words
The photoconductor cell according to claim 1, wherein the diameter of the root portion of the needle-shaped crystal is from 2 to 10 μm, and the length from the root to the top end of the needle-shaped crystal is from 50 to 150 μm.
References Cited (Backward Citations)
US3420763A
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US3503029A
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US3867145A
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US3674476A
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JPS4834492A
Cited
GB1504629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-24 | 1995-08-26 | 1996-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-24 | 1999-08-26 | 2000-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-24 | 2003-08-26 | 2004-02-25 | $7700.00 | Window Closed / Lapsed |