US4620209A
Expired / Lapsed
US
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Mosaic pattern of infrared detectors of different cut off wave lengths
Assignee: DRS Infrared Technologies LP
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Filing: 1984-09-28
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Granted: 1986-10-28
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Expires: 2004-09-28
Abstract
Abstract The disclosure relates to an infrared detector and method of making an infrared detector having HgCdTe detectors in the same focal plane of different compositions responsive to two or more different infrared frequency windows. This is accomplished by using SiO 2 and/or Si x O y N z for masking and/or isolation during liquid phase epitaxial growth of the HgCdTe. The SiO 2 and/or Si x O y N z are formed by plasma deposition.
Inventors
- 👤 Sidney G. Parker
- 👤 Rudy L. York
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:22
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/191; H10F39/193
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
55 words
In an infrared detector comprising: (a) a substrate, (b) a first layer of HgCdTe on said substrate in a predetermined focal plane; and (c) a second layer of HgCdTe on said substrate spaced from said first layer, having a ratio of Hg to Cd different from said first layer and in said predetermined focal plane.
Claim 2
Dependent Claim
55 words
In an infrared detector comprising: (a) a substrate, (b) a first layer of HgCdTe on said substrate in a predetermined focal plane; and (c) a second layer of HgCdTe on said substrate spaced from said first layer, having a ratio of Hg to Cd different from said first layer and in said predetermined focal plane.
Claim 3
Dependent Claim
17 words
In an infrared detector as set forth in claim 1 wherein said substrate is substantially electrically insulative.
Claim 4
Dependent Claim
17 words
In an infrared detector as set forth in claim 1 wherein said substrate is formed from CdTe.
Claim 5
Dependent Claim
17 words
In an infrared detector as set forth in claim 18 wherein said substrate is formed from CdTe.
References Cited (Backward Citations)
US4439912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |