US4080534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared detection and transmission apparatus
Assignee: AT&T Inc
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Filing: 1977-01-28
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Granted: 1978-03-21
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Expires: 1997-01-28
Abstract
Abstract Infrared detection and transmission apparatus are disclosed which incorporate an infrared transparent window consisting essentially of thorium fluoride. Due to high resistance to thermal shock, thorium fluoride window material may be used to advantage under extreme atmospheric conditions or for the transmission of infrared radiation at high power levels.
Inventors
- 👤 Howard Joseph Guggenheim
- 👤 Henry Miles O'Bryan, Jr.
- 👤 LeGrand Gerard Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:51
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/02; G01J1/04; G01J5/00; G01J5/02; G01J5/04; G01J5/046; G01J5/08; G01J5/0875; G02; G02B; G02B1/00; G02B1/02; G02B5/00; G02B5/20; G02B5/208; H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/034; H01S3/09; H01S3/095; H01S3/0951; H01S3/0953; H01S3/14; H01S3/22; H01S3/223; H01S3/225
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
36 words
An infrared radiation detection system comprising first means for detecting infrared radiation and second means for housing said first means CHARACTERIZED IN THAT said second means comprises an infrared transparent window consisting essentially of thorium fluoride.
Claim 2
Dependent Claim
36 words
An infrared radiation detection system comprising first means for detecting infrared radiation and second means for housing said first means CHARACTERIZED IN THAT said second means comprises an infrared transparent window consisting essentially of thorium fluoride.
Claim 3
Dependent Claim
13 words
Detection system of claim 1 in which said window is a single crystal.
Claim 4
Dependent Claim
14 words
Detection system of claim 1 in which said window is in a polycrystalline state.
Claim 5
Dependent Claim
19 words
Detection system of claim 1 in which an exposed surface of said window is coated with a protective coating.
Claim 6
Dependent Claim
35 words
Detection system of claim 4 in which the material of said coating is selected from the group consisting of ThO 2 , ZnS, MgF 2 , SiO 2 , and Si 3 N 4 .
Claim 7
Dependent Claim
35 words
An infrared transmission system comprising first means for producing infrared radiation and second means for housing said first means CHARACTERIZED IN THAT said second means comprises an infrared transparent window consisting essentially of thorium fluoride.
Claim 8
Dependent Claim
35 words
An infrared transmission system comprising first means for producing infrared radiation and second means for housing said first means CHARACTERIZED IN THAT said second means comprises an infrared transparent window consisting essentially of thorium fluoride.
Claim 9
Dependent Claim
13 words
Transmission system of claim 6 in which said window is a single crystal.
Claim 10
Dependent Claim
14 words
Transmission system of claim 6 in which said window is in a polycrystalline state.
Claim 11
Dependent Claim
19 words
Transmission system of claim 6 in which an exposed surface of said window is coated with a protective coating.
Claim 12
Dependent Claim
35 words
Transmission system of claim 9 in which the material of said coating is selected from the group consisting of ThO 2 , ZnS, MgF 2 , SiO 2 , and Si 3 N 4 .
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) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |