US3025191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal-growing apparatus and methods
Assignee: Raytheon Co
•
Filing: 1960-02-10
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Granted: 1962-03-13
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Expires: 1980-02-10
Abstract
No abstract record available.
Inventors
- 👤 Walter F Leverton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:42
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/10; C30B15/12; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1052; Y10T117/1056
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF GROWING A SINGLE CRYSTAL OF UNIFORM RESISTIVITY, SAID METHOD COMPRISING PULLING A SINGLE CRYSTAL FROM AN INITIAL MELT OF SEMICONDUCTIVE MATERIAL CONTAINING A DOPING AGENT, CAUSING A PORTION OF A SECOND MELT OF SEMICONDUCTIVE MATERIAL TO BE ADDED TO SAID INITIAL MELT AT A RATE DEPENDENT UPON THE RATE AT WHICH SEMICONDUCTIVE MATERIAL IS REMOVED FROM SAID INITIAL MELT BY SAID CRYSTAL-PULLING STEP WHEREBY THE VOLUME OF SAID INITIAL MELT IS MAINTAINED SUBSTANTIALLY CONSTANT DURING THE PULLING OPERATION AND ADDING A CONCENTRATION OF DOPING AGENT TO SAID INITIAL MELT SUBSTANTIALLY EQUAL TO THE CONCENTRATION OF DOPING AGENT REMOVED BY SAID GROWING CRYSTAL.
Claim 2
Independent Claim
105 words
THE METHOD OF GROWING A SINGLE CRYSTAL OF UNIFORM RESISTIVITY, SAID METHOD COMPRISING PULLING A SINGLE CRYSTAL FROM AN INITIAL MELT OF SEMICONDUCTIVE MATERIAL CONTAINING A DOPING AGENT, CAUSING A PORTION OF A SECOND MELT OF SEMICONDUCTIVE MATERIAL TO BE ADDED TO SAID INITIAL MELT AT A RATE DEPENDENT UPON THE RATE AT WHICH SEMICONDUCTIVE MATERIAL IS REMOVED FROM SAID INITIAL MELT BY SAID CRYSTAL-PULLING STEP WHEREBY THE VOLUME OF SAID INITIAL MELT IS MAINTAINED SUBSTANTIALLY CONSTANT DURING THE PULLING OPERATION AND ADDING A CONCENTRATION OF DOPING AGENT TO SAID INITIAL MELT SUBSTANTIALLY EQUAL TO THE CONCENTRATION OF DOPING AGENT REMOVED BY SAID GROWING CRYSTAL.
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) | 1965-03-12 | 1965-09-11 | 1966-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-12 | 1969-09-11 | 1970-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-12 | 1973-09-11 | 1974-03-13 | $7700.00 | Window Closed / Lapsed |