Patent US2945793A successfully refreshed from Google Patents.
US2945793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coloring diamonds
Assignee: Individual
•
Filing: 1958-04-28
•
Granted: 1960-07-19
•
Expires: 1978-04-28
Abstract
No abstract record available.
Inventors
- 👤 Dugdale Ronald Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:07
CPC Classifications
C; C04; C04B; C04B41/00; A; A44; A44C; A44C17/00; B; B01; B01J; B01J19/00; B01J19/08; B01J19/081; B01J19/085; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
THE PROCESS OF COLORING SUBSTANTIALLY COLORLESS DIAMONDS COMPRISED OF THE STEPS OF SUBJECTING THE COLORLESS DIAMONDS TO IRRADIATION BY ELECTRONS HAVING AN ENERGY OF 1 MEV. FOR APPROXIMATELY 1 HOUR HAVING AN INTEGRATED ELECTRON FLUX OF BETWEEN 1 AND 2X10**18 ELECTRONS/CM.2, WHEREBY THE DIAMONDS TAKE ON A BLUE COLOR WITH A SLIGHT GREEN TINT, AND THEN HEATING THE IRRADIATED DIAMONDS AT 500*C. FOR HALF AN HOUR WHEREBY THEY BECOME PURE BLUE.
Claim 2
Dependent Claim
71 words
THE PROCESS OF COLORING SUBSTANTIALLY COLORLESS DIAMONDS COMPRISED OF THE STEPS OF SUBJECTING THE COLORLESS DIAMONDS TO IRRADIATION BY ELECTRONS HAVING AN ENERGY OF 1 MEV. FOR APPROXIMATELY 1 HOUR HAVING AN INTEGRATED ELECTRON FLUX OF BETWEEN 1 AND 2X10**18 ELECTRONS/CM.2, WHEREBY THE DIAMONDS TAKE ON A BLUE COLOR WITH A SLIGHT GREEN TINT, AND THEN HEATING THE IRRADIATED DIAMONDS AT 500*C. FOR HALF AN HOUR WHEREBY THEY BECOME PURE BLUE.
References Cited (Backward Citations)
GB660719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |