Source: https://patents.google.com/patent/US7372552?oq=patent%3A+7360079
Timestamp: 2018-03-24 12:19:46
Document Index: 485983899

Matched Legal Cases: ['§119', 'Application No. 60', '§119', 'Application No. 60', '§119', 'Application No. 60']

US7372552B2 - Methods, apparatus, and systems for evaluating gemstones - Google Patents
US7372552B2
US7372552B2 US11018744 US1874404A US7372552B2 US 7372552 B2 US7372552 B2 US 7372552B2 US 11018744 US11018744 US 11018744 US 1874404 A US1874404 A US 1874404A US 7372552 B2 US7372552 B2 US 7372552B2
US11018744
US20050213077A1 (en )
This application claims priority under 35 U.S.C. §119 to Provisional Patent Application No. 60/532,201, entitled “THE OPTICAL DESIGN OF GEMSTONES,” and filed on Dec. 22, 2003. This application also claims priority under 35 U.S.C. §119 to Provisional Patent Application No. 60/563,025, entitled “GEMSTONE CUT GRADING” filed on Apr. 16, 2004. This application also claims priority under 35 U.S.C. §119 to Provisional Patent Application No. 60/607,191, entitled “GEMSTONE CUT GRADING,” filed on Sep. 3, 2004. The entire contents of U.S. Provisional Patent Application No's. 60/532,201, 60/563,025, and 60/607,191 are hereby incorporated by reference.
Where average Dx and/or average Dθ are relatively large (e.g., about the same or more than a Tolkowsky diamond), the diamond can be assigned a good grade for fire. In some embodiments, an average Dx of about 3.0 mm or more (e.g., about 3.2 mm or more, about 3.5 mm or more, about 3. 8 mm or more, about 4.0 mm or more) measured on a hemisphere of radius 25 cm, and/or an average Dθ of about 0.75° or more (e.g., about 1.0° or more, about 1.2° or more) can receive a good grade for fire. Alternatively, where average Dx and/or average Dθ are relatively small (e.g., average Dx of about 2.5 mm or less, about 2.0 mm or less, about 1.5 mm or less, average Dθ of about 0.5° or less, about 0.3° or less, about 0.2° or less, about 0.1° or less), the diamond can be assigned a poor grade for fire.
W s = W × ( A i A ) 3 ,
Range [mm] Deduction
Red in Image Deduction
leaked by Diamond Deduction
grades applied to parameters calculated with the diamond oriented at 15° with respect to
0 >35% 8.0%-22.0% 22.0%-30.0% <35.0% >35% <35.0%
*If the percentage of rays from 75° to 90° is greater than 22%, this deduction was made based on the percentage of rays from 70° to 90° .
0 >0.022 >0.022
For leakage and the percentage of rays at polar angles 45° to 75°, the larger of the two deductions is made for the measurements at different diamond orientations. For example, for diamond I, the diamond receives a deduction of 0 for the percentage of rays at polar angles 45° to 75° when the diamond is facing the source, but receives a deduction of 1 when the diamond is orientate at 15°. Accordingly, for this grading scheme, diamond 1 receives a deduction of 1 for this parameter. Deductions for each diamond, as well as the diamond's final grade are summarized in Table 11.
wherein the first range of ray directions corresponds to light incident on the gemstone from polar angles from about 45° to about 75° with respect to a hemispherical reference frame centered on the gemstone.
2. The method of claim 1, wherein the second range of ray directions corresponds to light incident on the gemstone from polar angles of about 75° or more with respect to the hemispherical reference flame.
4. The method of claim 3, wherein the third range of ray directions corresponds to light incident on the gemstone from polar angles of about 45° or less with respect to the hemispherical reference frame.
17. A handheld device for observing a gemstone comprising the apparatus of claim 12.
US11018744 2003-12-22 2004-12-20 Methods, apparatus, and systems for evaluating gemstones Active 2026-05-05 US7372552B2 (en)
US11018744 US7372552B2 (en) 2003-12-22 2004-12-20 Methods, apparatus, and systems for evaluating gemstones
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SASIAN, JOSE;CAUDILL, JAMES;YANTZER, PETER;REEL/FRAME:016474/0637;SIGNING DATES FROM 20050621 TO 20050628