US3927319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal for X-ray crystal spectrometer
Assignee: University of Southern California
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Filing: 1974-06-28
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Granted: 1975-12-16
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Expires: 1994-06-28
Abstract
Abstract A stepped curved crystal for an x-ray crystal spectrometer and the like providing more effective area and hence improved signal to background ratio over conventional curved crystals. A stepped crystal formed of a plurality of crystal strips assembled in a flat configuration and bent to place the steps on a focal circle of radius r, with the crystal atomic planes on circles of radius substantially 2r.
Inventors
- 👤 David B Wittry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:16
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/06; G21K2201/00; G21K2201/06; G21K2201/062; G21K2201/064; G21K2201/067
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A crystal for an x-ray crystal spectrometer and the like, comprising: a cylindrical curved crystal comprising a plurality of separate strips of bulk single crystal material joined in a sandwich form having a plurality of substantially parallel surfaces in a stepped configuration, with the steps substantially on a focal circle of radius r, and with the crystal atomic planes on circles of radius substantially 2r.
Claim 2
Dependent Claim
65 words
A crystal for an x-ray crystal spectrometer and the like, comprising: a cylindrical curved crystal comprising a plurality of separate strips of bulk single crystal material joined in a sandwich form having a plurality of substantially parallel surfaces in a stepped configuration, with the steps substantially on a focal circle of radius r, and with the crystal atomic planes on circles of radius substantially 2r.
Claim 3
Dependent Claim
15 words
A crystal as defined in claim 1 with said steps in descending and ascending order.
Claim 4
Dependent Claim
17 words
A crystal as defined in claim 1 including strips of x-ray absorbing material between said crystal strips.
Claim 5
Dependent Claim
16 words
A crystal as defined in claim 1 with said steps straight and parallel to each other.
Claim 6
Dependent Claim
27 words
A crystal as defined in claim 1 with said steps V shaped, with apices of steps on opposite sides of a central portion directed toward each other.
Claim 7
Dependent Claim
18 words
A crystal as defined in claim 1 with x-ray non-reflecting material on the non-effective areas of said surfaces.
Claim 8
Independent Claim
74 words
A method of making a crystal for an x-ray crystal spectrometer and the like, including steps of: making a stepped sandwich of a plurality of separate strips of bulk single crystal material having parallel flat surfaces with parallel crystal atomic planes; and bending the sandwich into a cylindrical curve with the steps substantially on a focal circle of radius r, and with the crystal atomic planes and surfaces on circles of radius substantially 2r.
Claim 9
Independent Claim
74 words
A method of making a crystal for an x-ray crystal spectrometer and the like, including steps of: making a stepped sandwich of a plurality of separate strips of bulk single crystal material having parallel flat surfaces with parallel crystal atomic planes; and bending the sandwich into a cylindrical curve with the steps substantially on a focal circle of radius r, and with the crystal atomic planes and surfaces on circles of radius substantially 2r.
Claim 10
Dependent Claim
28 words
The method of claim 7 including the step of bonding the strips with a transparent adhesive having an optical index of refraction different from that of the strips.
Claim 11
Dependent Claim
19 words
The method of claim 7 including the step of placing strips of x-ray absorbing material between the crystal strips.
References Cited (Backward Citations)
US3469098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |