US3867032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for objectively evaluating characteristics of gems, particularly diamonds
Assignee: Diharo Diamanten Handels Establishment Cie
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Filing: 1974-03-08
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Granted: 1975-02-18
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Expires: 1994-03-08
Abstract
Abstract The arrangement includes an ellipsoidal mirror having a first focal point and a second focal point. Light is emitted from the first focal point. A gem is supported at the second focal point with such an orientation that the light emitted from the first focal point and reaching and entering the gem will be reflected by the gem towards a plane containing the first focal point and oriented normal to a line joining the focal points. The gem is surrounded and engaged by a light blocking arrangement to prevent the passage of light past such gem around the outermost portions of the gem. The light emitted from the first focal point and reflected by the gem towards such plane is measured.
Inventors
- 👤 Gernot Klaus Bruck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:57
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/87; G01N33/00; G01N33/389
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
140 words
An arrangement for evaluating the optical characteristics of gems, especially diamonds, comprising, in combination, an ellipsoidal mirror having a first focal point and a second focal point; light-emitting means for emitting light from said first focal point; gem support means for holding a gem at said second focal point with such an orientation that light emitted from said first focal point and reaching and entering the gem will be reflected by the gem towards a plane containing said first focal point and oriented normal to a line joining said focal points, said gem support means including means surrounding and engaging the gem and blocking off the passage of light past such gem around the outermost portions of the gem; and light-measuring means for measuring the light emitted from said first focal point and reflected by such gem towards said plane.
Claim 2
Dependent Claim
140 words
An arrangement for evaluating the optical characteristics of gems, especially diamonds, comprising, in combination, an ellipsoidal mirror having a first focal point and a second focal point; light-emitting means for emitting light from said first focal point; gem support means for holding a gem at said second focal point with such an orientation that light emitted from said first focal point and reaching and entering the gem will be reflected by the gem towards a plane containing said first focal point and oriented normal to a line joining said focal points, said gem support means including means surrounding and engaging the gem and blocking off the passage of light past such gem around the outermost portions of the gem; and light-measuring means for measuring the light emitted from said first focal point and reflected by such gem towards said plane.
Claim 3
Dependent Claim
39 words
An arrangement as defined in claim 1, wherein said light-measuring means comprises a plurality of photocells arranged In said plane and oriented to receive light emitted from said first focal point and reflected by such gem towards said plane.
Claim 4
Dependent Claim
71 words
An arrangement as defined in claim 1, and further including light-measuring means comprised of light-sensitive means so positioned relative to said gem support means as to be located to that side of the supported gem which is opposite to the side thereof which faces said plane and operative for measuring the amount of light emitted from said first focal point which penetrates the gem and emerges from such opposite side thereof.
Claim 5
Dependent Claim
31 words
An arrangement as defined in claim 3, wherein said light-measuring means includes condensing lens means for condensing onto said light-sensitive means light penetrating the gem and emerging from such opposite side.
Claim 6
Dependent Claim
52 words
An arrangement as defined in claim 3, wherein said light-measuring means includes a member provided with an aperture so positioned relative to said gem support means that light penetrating a gem supported by said gem support and emerging from such opposite side must pass through said aperture to reach said light-sensitive means.
Claim 7
Dependent Claim
31 words
An arrangement as defined in claim 5, wherein said light-measuring means includes condensing lens means for condensing onto said light-sensitive means light penetrating the gem and emerging from such opposite side.
Claim 8
Dependent Claim
28 words
An arrangement as defined in claim 1, wherein said gem support means is rotatable about said second focal point and furthermore is pivotable about said second focal point.
Claim 9
Dependent Claim
81 words
An arrangement as defined in claim 7, wherein said gem has a Rhondist plane and wherein said gem support means comprises a chamber in which siad light-sensitive means is positioned, said light-sensitive means being rotatable and pivotable with said gem support means, and wherein said gem support means comprises two centrally apertured members oriented and positioned to surround and releasably engage a gem being supported by said support means above and below the edge of the Rondist plane of the gem.
Claim 10
Dependent Claim
35 words
An arrangement as defined in claim 8, wherein said centrally apertured members are removable, and including a plurality of additional centrally apertured members having central apertures of different sizes to accommodate gems of different sizes.
Claim 11
Dependent Claim
59 words
An arrangement as defined in claim 7, wherein said gem support means comprises a gem-engaging first portion having an outer spherical surface and a second portion having a complementary inner spherical surface, said first portion being mounted in said second portion so as to permit both rotational and pivoting movement of said first portion relative to said second portion.
Claim 12
Dependent Claim
39 words
An arrangement as defined in claim 1, wherein said light-measuring means comprises a light measuring instrument for separately measuring the spectral components of light, and light-conducting means operative for conducting light from said plane to said light measuring instrument.
Claim 13
Dependent Claim
44 words
An arrangement as defined in claim 11, wherein said light-conducting means comprises condensing lens means operative for focussing the light reflected into said plane onto a second plane, and means for transmitting the focussed light from such second plane to said light measurement instrument.
Claim 14
Dependent Claim
44 words
An arrangement as defined in claim 11, wherein said light-conducting means comprises focussing mirror means operative for focussing the light reflected into said plane onto a second plane, and means for transmitting the focussed light from such second plane to said light measuring instrument.
Claim 15
Dependent Claim
30 words
An arrangement as defined in claim 11, wherein said light measuring instrument comprises means for resolving light into its spectral components and for separately measuring the intensity of such components.
Claim 16
Dependent Claim
44 words
An arrangement as defined in claim 11, wherein said light measuring instrument comprises photosensitive means operative for converting light incident thereupon into electrical signals, and electrical measuring means operative for indicating the Intensity of the light by indicating the strength of such electrical signals.
Claim 17
Dependent Claim
54 words
An arrangement as defined in claim 1, wherein said light-emitting means comprises a remotely located source of light and light-conducting means having a first end connected to said source to receive light and having a second end located at said first focal point to emit light and having a radiating character of 180* .
Claim 18
Dependent Claim
26 words
An arrangement as defined in claim 1, wherein said light-emitting means comprises a laser arrangement operative for emitting from said first focal point a laser beam.
Claim 19
Dependent Claim
43 words
An arrangement as defined in claim 17, wherein said light-emitting means further comprises deflecting mirror means operative for deflecting the laser beam of said laser beam arrangement to cause such beam to travel in direction parallel to the line joining said focal points.
Claim 20
Dependent Claim
33 words
An arrangement as defined in claim 17, wherein said light-emitting means comprises a ground glass sphere located at said first focal point, said laser beam being oriented to intersect said first focal point.
Claim 21
Dependent Claim
33 words
An arrangement as defined in claim 17, wherein said light-emitting means comprises a ground glass hemisphere located at said first focal point, said laser beam being oriented to intersect said first focal point.
References Cited (Backward Citations)
US3740142A
Cited
US3794424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |