US4948976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-wavelength band infrared detector
Assignee: Business Alliance Capital Corp
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Filing: 1989-02-09
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Granted: 1990-08-14
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Expires: 2009-02-09
Abstract
Abstract An infrared detector capable of obtaining coincident fields of view of infrared radiation of different wavelengths is provided. The detector comprises a sandwich-type construction including PbSe and PbS photoconductive film layers.
Inventors
- 👤 Shankar B. Baliga
- 👤 Adishwar L. Jain
- 👤 John A. Little
- 👤 Martin R. Rost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:00
CPC Classifications
H; H10; H10F; H10F30/00; H10F30/10; H10F77/00; H10F77/10; H10F77/12; H10F77/127; H10W; H10W90/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
An infrared detector comprising a first thin film detector layer of PbSe responsive to infrared radiation in a first wavelength band, a second thin film detector layer of PbS overlying said first detector layer and responsive to infrared radiation in a second wavelength band and transparent to infrared radiation in said first wavelength band and contacts connected to each of said detector layers.
Claim 2
Dependent Claim
63 words
An infrared detector comprising a first thin film detector layer of PbSe responsive to infrared radiation in a first wavelength band, a second thin film detector layer of PbS overlying said first detector layer and responsive to infrared radiation in a second wavelength band and transparent to infrared radiation in said first wavelength band and contacts connected to each of said detector layers.
Claim 3
Dependent Claim
19 words
The invention in accordance with claim 1 further comprising a layer of arsenic triselenide immediately overlying said PbSe layer.
Claim 4
Dependent Claim
34 words
The invention in accordance with claim 2 further comprising a transmissive glass layer immediately overlying said arsenic triselenide layer, said glass layer having a refractive index matched to that of said arsenic triselenide layer.
Claim 5
Dependent Claim
17 words
The invention in accordance with claim 3 wherein said transmissive glass layer is formed of silicon monoxide.
Claim 6
Dependent Claim
19 words
The invention in accordance with claim 3 wherein said transmissive glass layer forms a substrate for said PbS film.
Claim 7
Dependent Claim
16 words
The invention in accordance with claim 1 further comprising a sealing layer overlying said PbS layer.
Claim 8
Dependent Claim
14 words
The invention in accordance with claim 6 wherein said sealing layer comprises arsenic trisulfide.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |