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US3723599A
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Technique for growth of single crystal gallium garnet
Assignee: AT&T Inc
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Filing: 1971-08-18
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Granted: 1973-03-27
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Expires: 1991-08-18
Abstract
Abstract Rare earth gallium garnet crystals evidencing low dislocation densities are obtained by the crystal pulling techniques utilizing an oxygen containing ambient wherein the partial pressure of oxygen ranges from about 3.8-19 millimeters of mercury.
Inventors
- 👤 C Brandle
- 👤 D Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:51
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/24; H01F41/28; C; C30; C30B; C30B15/00; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
Technique in accordance with claim 1 wherein the melt comprises a stochiometric mixture of the constituent components of said garnet.
Claim 2
Dependent Claim
26 words
Technique in accordance with claim 1 wherein the melt includes an excess of the constituent components of said garnet ranging up to 7 percent by weight.
Claim 3
Dependent Claim
13 words
Technique in accordance with claim 1 wherein said rare earth element is gadolinium.
Claim 4
Dependent Claim
10 words
Technique in accordance with claim 2 wherein Me is scandium.
Claim 5
Dependent Claim
15 words
Technique in accordance with claim 3 wherein said melt comprises an excess of gallium oxide.
Claim 6
Dependent Claim
10 words
Technique in accordance with claim 4 wherein Me is scandium.
Claim 7
Dependent Claim
15 words
Technique in accordance with claim 4 wherein said melt comprises an excess of gadolinium oxide.
Claim 8
Dependent Claim
24 words
Technique in accordance with claim 8 wherein the partial pressure of oxygen is maintained at 15.2 millimeters of mercury prior to and during growth.
References Cited (Backward Citations)
US3272591A
Cited
US3079240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |