Patent US4181774A successfully refreshed from Google Patents.
US4181774A
Expired / Lapsed
US
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Electromagnetic interference filter window
Assignee: United States Department of the Air Force
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Filing: 1978-12-19
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Granted: 1980-01-01
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Expires: 1998-12-19
Abstract
Abstract A laser window material for use in the infrared wavelength spectrum comprising a glass substrate having an indium tin oxide conductive film deposited in one surface thereof and magnesium fluoride antireflection films deposited atop the conductive film and the opposite surface of the glass substrate.
Inventors
- 👤 Jerry P. Wendt
- 👤 Andrew J. Steckl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:18
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/034; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
A laser window material comprising (a) a glass substrate; (b) a thin sputtered coating of an indium tin oxide alloy deposited on one surface of said substrate; (c) a first, thin, magnesium fluoride coating deposited on said sputtered coating; and (d) a second, thin, magnesium fluoride coating deposited on the other surface of said substrate.
Claim 2
Dependent Claim
55 words
A laser window material comprising (a) a glass substrate; (b) a thin sputtered coating of an indium tin oxide alloy deposited on one surface of said substrate; (c) a first, thin, magnesium fluoride coating deposited on said sputtered coating; and (d) a second, thin, magnesium fluoride coating deposited on the other surface of said substrate.
Claim 3
Dependent Claim
19 words
A laser window material in accordance with claim 1 wherein said sputtered coating is approximately 1000 A in thickness.
Claim 4
Dependent Claim
33 words
A laser window material in accordance with claim 2 wherein said first magnesium fluoride coating is approximately 1400 A in thickness and said second magnesuim fluoride coating is approximately 2000 A in thickness.
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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |