US4301134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel diamond products and the manufacture thereof
Assignee: General Electric Co
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Filing: 1978-03-10
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Granted: 1981-11-17
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Expires: 1998-03-10
Abstract
Abstract Diamond crystals of controlled impurity content and/or impurity distribution and reaction vessel configurations for the production thereof are described. Combinations of "dopant", "getter" and "compensator" materials are employed to produce gem stones of unusual color patterns, or zoned coloration, using specific reaction vessel configurations.
Inventors
- 👤 Herbert M. Strong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:18
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/061; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/068
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A synthetic gem size single crystal diamond at least 1/20th of a carat in weight which is by a temperature gradient method grown from, but separate from, a diamond seed, said crystal comprising a first growth core portion having a color selected from the group consisting of yellow, green and blue and a successively grown, second growth outer portion which envelopes said first growth core portion, said second growth outer portion having a color different from said core portion and selected from the group consisting of yellow, green and colorless, with the boundary between said portions being diffuse and without interruption.
Claim 2
Dependent Claim
101 words
A synthetic gem size single crystal diamond at least 1/20th of a carat in weight which is by a temperature gradient method grown from, but separate from, a diamond seed, said crystal comprising a first growth core portion having a color selected from the group consisting of yellow, green and blue and a successively grown, second growth outer portion which envelopes said first growth core portion, said second growth outer portion having a color different from said core portion and selected from the group consisting of yellow, green and colorless, with the boundary between said portions being diffuse and without interruption.
Claim 3
Dependent Claim
12 words
The diamond crystal of claim 1, wherein said outer portion is colorless.
Claim 4
Dependent Claim
11 words
The diamond crystal of claim 1, wherein said core is yellow.
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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |