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 Title: |
US4749869:
Process for irradiating topaz and the product resulting therefrom
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Fournier, Richard; Placentia, CA
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| Assignee: |
Dholakia; Anil, New York, NY
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| Published / Filed: |
1988-06-07
/ 1986-05-14
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| Application Number: |
US1986000863083
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| IPC Code: |
Advanced:
C04B 41/80;
C30B 29/34;
C30B 33/00;
C30B 33/04;
Core:
C30B 29/10;
more...
IPC-7:
A21K 27/02;
A61N 5/00;
C08J 1/02;
G21G 5/00;
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| U.S. Class: |
Current:
250/492.1;
430/004;
Original:
250/492.1;
430/004;
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| Field of Search: |
250/492.1
430/004
204/157.15
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| Priority Number: |
| 1986-05-14 |
US1986000863083 |
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| Abstract: |
A process for the irradiation of topaz and the product resulting therefrom is described whereby the colorless or pale-colored topaz is immersed in a high energy neutron environment at an exposure level sufficient to bring some color to the topaz gemstone, then irradiating the topaz gemstone with electrons at an exposure level in the range of approximately 1,000 to 10,000 megarads to produce a remarkable and enhanced "American" blue color. The purpose of such a process is to enhance the value of the preferred relatively "normal" sky-blue topaz gemstone by moderately deepening the blueness of the color of the topaz gemstone to a relatively "rare" and more desirable blue color such as "American Blue" or "Super Sky Blue". A further step of heating the topaz to about a temperature in the range of from 250 to 900 degrees Fahrenheit for periods of from about one to six hours may also be used to further enhance the color of the topaz following electron bombardment.
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| Attorney, Agent or Firm: |
Lothrop & West ;
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| Primary / Asst. Examiners: |
Anderson, Bruce C.;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
DE FR GB
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| Family: |
Show 15 known family members
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First Claim:
Show all 12 claims |
What is claimed is:
1. A method for producing color change in topaz by the use of high energy neutron radiation and electron bombardment comprising the steps of:
- (a) irradiating colorless or pale-colored topaz in a neutron environment to an exposure level sufficient to produce some color so that when subsequently irradiated with electrons from approximately 1,000 to 10,000 megarads a bright blue color will be obtained; and then,
- (b) irradiating the neutron bombarded topaz with electrons at an exposure level of from approximately 1,000 to 10,000 megarads until the desired bright blue color is obtained.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 12 U.S. patent(s) that reference this one
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