US4317751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thallium doped potassium iodide filter
Assignee: ITT Inc
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Filing: 1980-06-26
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Granted: 1982-03-02
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Expires: 2000-06-26
Abstract
Abstract An ultraviolet optical filter is provided having a first filter element including a 2,7-dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate and second filter element including a crystal of thallium doped potassium iodide. A method for filtering light is also disclosed.
Inventors
- 👤 Robert J. Kraushaar
- 👤 Kevin B. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:03
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/223; G02B5/208
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
20 words
An optical filter comprising a first filter element including thallium doped potassium iodide and a second filter element including 2,7-dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate.
Claim 2
Dependent Claim
20 words
An optical filter comprising a first filter element including thallium doped potassium iodide and a second filter element including 2,7-dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate.
Claim 3
Dependent Claim
22 words
A filter as described in claim 1 wherein said first filter element is between 10 -1 and 10 -2 mole percent thallium.
Claim 4
Dependent Claim
18 words
A filter as described in claim 2 wherein said first filter element is about 3 mm in thickness.
Claim 5
Dependent Claim
32 words
A filter as described in claim 2 wherein said first filter element is positioned within a coupling fluid capable of protecting said first filter element from atmospheric moisture and reducing surface losses.
Claim 6
Dependent Claim
14 words
A filter as described in claim 1 wherein said 2,7-dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate is dissolved in glycerol.
Claim 7
Dependent Claim
35 words
A filter as described in claim 1 wherein said first filter element is positioned between filter sections of ultraviolet glass, said second filter element being in liquid form and contained within an ultraviolet glass cell.
Claim 8
Dependent Claim
36 words
A filter as described in claim 6 further including a nickel sulfate hexahydrate element positioned such that light may pass through said first filter element, said second filter element, and said nickel sulfate hexahydrate element, respectively.
Claim 9
Dependent Claim
24 words
A filter as described in claims 1, 2 or 3 wherein said first filter element is a single crystal of thallium doped potassium iodide.
Claim 10
Independent Claim
35 words
A method of filtering light to selectively transmit ultraviolet, which comprises: inserting in the path of said light a filter including a thallium doped potassium iodide filter element and another filter element including 2,7 dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate.
Claim 11
Independent Claim
35 words
A method of filtering light to selectively transmit ultraviolet, which comprises: inserting in the path of said light a filter including a thallium doped potassium iodide filter element and another filter element including 2,7 dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate.
Claim 12
Dependent Claim
25 words
A method as described in claim 9 wherein said thallium doped potassium iodide filter element is between 10 -1 and 10 -2 mole percent thallium.
Claim 13
Dependent Claim
15 words
A method as described in claim 10 wherein said 2,7 dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate is dissolved in glycerol.
Claim 14
Dependent Claim
21 words
A method as described in claim 10 wherein said thallium doped potassium iodide element is a single crystal of potassium iodide.
Claim 15
Dependent Claim
37 words
A method as described in claim 9 wherein said thallium doped potassium iodide element is positioned between filter sections of ultraviolet glass, said other filter element being in liquid form and contained within an ultraviolet glass cell.
Claim 16
Dependent Claim
51 words
A method as described in claim 9 or claim 13 further including the step of providing a filter element comprising nickel sulfate hexahydrate within said filter such that light passes through said thallium doped potassium iodide filter element, said 2,7 dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate filter element, and said nickel sulfate hexahydrate filter element, respectively.
References Cited (Backward Citations)
US2128110A
Cited
US3801179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-01 | 1985-08-31 | 1986-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-01 | 1989-08-31 | 1990-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-01 | 1993-08-31 | 1994-03-02 | $7700.00 | Window Closed / Lapsed |