Cut design of diamonds providing plenty of...

Details Cut design of diamonds providing plenty of... Cut design of diamonds providing plenty of...

2007-06-05

2007-06-05

Lavinder, Jack W. (Department: 3677)

Jewelry

Gem

Reexamination Certificate

active

10350388

ABSTRACT:
A cut design of an ornamental diamond and an observation method of the diamond which an observer can perceive a more beauty, are disclosed. The cut design is a round brilliant cut comprising a girdle, a crown above the girdle and a pavilion below the girdle. A girdle height (h) is 0.026 to 0.3 times a girdle radius, a pavilion angle (p) of a pavilion main facet ranges from 37.5 degrees to 41 degrees, and a crown angle (c) of a crown main facet is within a range of satisfying: c>−2.8667×p+134.233 and p<¼×{(sin−1(1
)+sin−1(1
·sin c))×180/π+180−2c}, wherein n: refraction index of a diamond, π: circular constant, p: pavilion angle in degrees, and c: crown angle in degrees. The cut design of the ornamental diamond provides an observer with plenty of visual-perceptible reflection when the observer watches the diamond above a table facet with a sight line of an angle less than 20 degrees with a vertical line at the center of the table facet.

REFERENCES:
patent: 693084 (1902-02-01), Townsend
patent: 809531 (1906-01-01), Schench
patent: 2340659 (1944-02-01), Goldstein
patent: D204199 (1966-03-01), Westreich
patent: 4083352 (1978-04-01), Andrychuk
patent: 4308727 (1982-01-01), Elbe
patent: 4708001 (1987-11-01), Alburger
patent: 5090216 (1992-02-01), Waugh
patent: D330873 (1992-11-01), Kaplan
patent: 5970744 (1999-10-01), Greeff
patent: D437671 (2001-02-01), Fajerstein
patent: D444098 (2001-06-01), Hurwitz
patent: 6305193 (2001-10-01), Cheng
patent: 6474102 (2002-11-01), Buerger
patent: 197 34 036 (1999-02-01), None
S. S. Stevens, Jan. 13, 1961, To Honor Fechner and Repeal His Law, Science, vol. 133.

Affiliated with

Also associated with

Rating

Cut design of diamonds providing plenty of... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cut design of diamonds providing plenty of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cut design of diamonds providing plenty of... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3850832