US3980883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray diffraction gratings
Assignee: National Research Development Corp UK
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Filing: 1975-10-03
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Granted: 1976-09-14
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Expires: 1995-10-03
Abstract
Abstract An x-ray diffraction grating consisting of a structure having a surface capable of reflecting x-rays, said surface being grooved so that in cross-section the profile of said surface alternates regularly between geometrically similar lines, in which the height of the alternation varies significantly over the area of the surface. The grating may be plane or curved; the variation in height may occur as a single step, a plurality of steps or may be continuous; the variation may occur either transverse to or parallel to the grooving.
Inventors
- 👤 Albert Franks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:15
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/06; G21K2201/00; G21K2201/06; G21K2201/064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
An x-ray diffraction grating consisting of a structure having a surface capable of reflecting x-rays, said surface being grooved so that in cross-section that profile of said surface alternates regularly between geometrically similar lines with the height of the alternation varying significantly over the area of said surface.
Claim 2
Dependent Claim
48 words
An x-ray diffraction grating consisting of a structure having a surface capable of reflecting x-rays, said surface being grooved so that in cross-section that profile of said surface alternates regularly between geometrically similar lines with the height of the alternation varying significantly over the area of said surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |