US4125770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond identification
Assignee: Individual
•
Filing: 1977-06-30
•
Granted: 1978-11-14
•
Expires: 1997-06-30
Abstract
Abstract A method of determining whether a diamond is the same as or different to a known diamond characterized by the steps of producing one or more records of internal defects of the diamond using X-ray topography and comparing the record or records so produced with a similar record or records produced from the known diamond.
Inventors
- 👤 Andrew R. Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:28
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/20; G01N23/205; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; G01N33/00; G01N33/389; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
55 words
A method of determining whether a diamond to be identified is the same as or different to a known diamond including the steps of producing one or more records of internal defects of the diamond to be identified using X-ray topography and comparing the records so produced with similar records produced from the known diamond.
Claim 2
Independent Claim
55 words
A method of determining whether a diamond to be identified is the same as or different to a known diamond including the steps of producing one or more records of internal defects of the diamond to be identified using X-ray topography and comparing the records so produced with similar records produced from the known diamond.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein the records are those produced using X-ray diffraction at the Bragg angle.
Claim 4
Dependent Claim
58 words
A method according to claim 1 wherein the records of the specimen are produced by so orienting the specimen with respect to the range of orientations of the X-rays contained in the X-ray beam incident upon the specimen that a fraction of the volume of the specimen substantially satisfies the condition of X-ray diffraction at the Bragg angle.
Claim 5
Dependent Claim
63 words
A method according to claim 1 wherein the records of the specimen are produced by illuminating the specimen with an X-ray beam whose spectral distribution and whose range of orientations with respect to the specimen are so chosen that a fraction of the specimen departs from exact satisfaction of the condition of X-ray diffraction at the Bragg angle by a determined small angle.
Claim 6
Dependent Claim
12 words
A method according to claim 1 wherein the records are X-ray topographs.
Claim 7
Dependent Claim
14 words
A method according to claim 1 wherein the known diamond is an uncut diamond.
Claim 8
Dependent Claim
75 words
A method according to claim 1 wherein the records of a selected region of the specimen are produced by illuminating the specimen with an X-ray beam whose spectral distribution and whose range of orientations with respect to said selected region of the specimen are so chosen that a fraction of said selected region of the specimen departs from exact satisfaction of the condition of X-ray diffraction at the Bragg angle by a determined small angle.
Claim 9
Dependent Claim
14 words
A method according to claim 1 wherein said records are produced using monochromatic radiation.
Claim 10
Dependent Claim
19 words
A method according to claim 1 wherein surface damage is removed from the diamond prior to records being produced.
Claim 11
Dependent Claim
13 words
A method according to claim 9 wherein surface damage is removed by etching.
Claim 12
Dependent Claim
14 words
A method according to claim 1 wherein the known diamond is a rough diamond.
Claim 13
Dependent Claim
17 words
A method according to claim 11 wherein the diamond to be identified is a partially cut diamond.
Claim 14
Dependent Claim
17 words
A method according to claim 11 wherein the diamond to be identified is a fully cut diamond.
Claim 15
Dependent Claim
66 words
A method according to claim 1 wherein the records of a selected region of the specimen are produced by so orienting the specimen with respect to the range of orientations of the X-rays contained in the X-ray beam incident upon the specimen that a fraction of the volume of said selected region of the specimen substantially satisfies the condition of X-ray diffraction at the Bragg angle.
Claim 16
Dependent Claim
25 words
A method according to claim 14 including producing the records from the known diamond and the diamond to be identified according to a predetermined routine.
Claim 17
Dependent Claim
20 words
A method according to claim 15 wherein said predetermined routine comprises a series of diffraction radiographs using crystallographically equivalent reflections.
Claim 18
Dependent Claim
37 words
A method according to claim 15 wherein said predetermined routine comprises selecting three cube planes in each of which four radiographs are taken, the crystal being rotated 90° around a perpendicular to the plane between each radiograph.
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |