Patent US3796552A successfully refreshed from Google Patents.
US3796552A
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Crucible
Assignee: Raytheon Co
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Filing: 1972-01-03
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Granted: 1974-03-12
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Expires: 1992-01-03
Abstract
Abstract The crucible is formed of compacted graphite or vitreous carbon and has an interior tapered toward its nucleation point. Single and multiport types are described for growing one or more crystals similtaneously. The crucible is useful for growing laser quality crystals of alkaline earth and rare earth fluorides, including mixed rare earth fluorides and mixed rare earthalkaline earth fluorides which are free from oxides and oxyfluorides.
Inventors
- 👤 M Robinson
- 👤 D Cripe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:50
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; C; C01; C01F; C01F17/00; C01F17/10; C01F17/13; C01F17/20; C01F17/206; C01F17/253; C01F17/265; C01F17/271; C01F17/30; C01F17/36; C30; C30B; C30B11/00; C30B11/002; C30B29/00; C30B29/10; C30B29/12; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S117/906; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1092
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A crucible as in claim 1 further including an entry portion provided with opening means of greater dimension than that of said bore means at said first end and a connecting portion secured between said entry portion and said tube at said first end, said connecting portion having a tapered bore diminishing in dimension from the entry portion bore to the first end.
Claim 2
Dependent Claim
14 words
A crucible as in claim 1 wherein said tube is constructed of compacted graphite.
Claim 3
Dependent Claim
85 words
A multiport crucible for simultaneously processing several cyrstals including a plurality of elongate tubes for each of the several crystals, each said tube having internal bore means bounded by first and second open portions, and a closed pointed end terminating said second open portion, said bore means of each said tube being of greater dimension at said first open portion than at said second open portion to form a taper in said bore means, and means securing said tubes together at said first open portions.
Claim 4
Dependent Claim
47 words
A crucible as in claim 4 further including an entry section having a plurality of entry ports, each of said ports having a dimension greater than that of each of said first open portions, and passage means connected between said entry ports and said first open portions.
Claim 5
Dependent Claim
22 words
A crucible as in claim 5 further including a plurality of fins secured to said entry section and partially enclosing said tubes.
Claim 6
Dependent Claim
10 words
A crucible as in claim 6 formed from compacted graphite.
References Cited (Backward Citations)
US2594998A
Cited
US3694166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |