US3278274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of pulling monocrystalline silicon carbide
Assignee: International Business Machines Corp
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Filing: 1964-11-13
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Granted: 1966-10-11
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Expires: 1984-11-13
Abstract
No abstract record available.
Inventors
- 👤 Liebmann Wolfgang
- 👤 Werner K Spielmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:14
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/14; C30B15/16; C30B29/00; C30B29/10; C30B29/36; C30B9/00; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S117/903; Y10S117/904; Y10S117/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
METHOD OF PULLING MONOCRYSTALLINE SIC FROM A MELT AT A CRYSTALLIZING FRONT THEREBETWEEN COMPRISING THE STEPS OF: PULLING A SEED OF MONOCRYSTALLINE SIC FROM A MELT OF CR AND SIC, SAID MELT BEING HEATED BY A FIRST EXTERNAL HEATING MEANS TO FORM A HEMISPHERICAL ZONE OF HIGH CR CONCENTRATION IN THE REGION OF SAID CRYSTALLIZING FRONT; AND
Claim 2
Dependent Claim
57 words
METHOD OF PULLING MONOCRYSTALLINE SIC FROM A MELT AT A CRYSTALLIZING FRONT THEREBETWEEN COMPRISING THE STEPS OF: PULLING A SEED OF MONOCRYSTALLINE SIC FROM A MELT OF CR AND SIC, SAID MELT BEING HEATED BY A FIRST EXTERNAL HEATING MEANS TO FORM A HEMISPHERICAL ZONE OF HIGH CR CONCENTRATION IN THE REGION OF SAID CRYSTALLIZING FRONT; AND
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |