Patent US2835612A successfully refreshed from Google Patents.
US2835612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor purification process
Assignee: Motorola Solutions Inc
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Filing: 1954-08-23
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Granted: 1958-05-20
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Expires: 1974-08-23
Abstract
No abstract record available.
Inventors
- 👤 William E Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:55
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/02; Y; Y10; Y10S; Y10S438/00; Y10S438/914; Y10S438/925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A METHOD OF TREATING A SUBSTANCE TO ALTER THE CONCENTRATIONS OF CERTAIN ALLOYING IMPURITIES CONTAINED THEREIN, WHICH SUBSTANCE HAS A CERTAIN MELTING POINT AND WHICH IMPURITIES HAVE MELTING POINTS DIFFERENT FROM SAID SUBSTANCE AND DIFFERENT FROM ONE ANOTHER, WHICH METHOD INCLUDES THE STEP OF PROVIDING A SOLID CHARGE OF THE SUBSTANCE TO BE TREATED, PROVIDING A LIQUID REGION OF THE SUBSTANCE IN CONTACT WITH SAID SOLID CHARGE, WITH THE SUBSTANCE AND THE ALLOYING IMPURITIES EXISTING IN AN EQUILIBRIUM STATE BETWEEN THE LIQUID AND THE SOLID REGIONS AND WITH THE IMPURITIES HAVING DIFFERENT CONCENTRATION RATIOS BETWEEN SAID LIQUID AND SOLID REGIONS, PROVIDING A SELECTED ALLOYING AGENT WHICH HAS THE PROPERTY OF ALLOYING WITH SAID IMPURITIES TO ALTER THE MELTING POINTS THEREOF, INTRODUCING SAID ALLOYING AGENT INTO SAID LIQUID REGION IN SUFFICIENT QUANTITY TO ALLOY WITH SAID IMPURITIES AND THEREBY ALTER THEIR MELTING POINTS, AND CAUSING SAID LIQUID REGION TO SWEEP ACROSS THE CHARGE OF THE SUBSTANCE TO BE TREATED SO THAT THE SUBSTANCE IS DISSOLVED INTO THE LEADING EDGE OF THE LIQUID REGION AND IS DEPOSITED FROM THE TRAILING EDGE THEREOF WITH DIFFERENT CONCENTRATIONS OF SAID IMPURITIES AS COMPARED WITH THE ORIGINAL CHARGE OF THE SUBSTANCE.
Claim 2
Independent Claim
195 words
A METHOD OF TREATING A SUBSTANCE TO ALTER THE CONCENTRATIONS OF CERTAIN ALLOYING IMPURITIES CONTAINED THEREIN, WHICH SUBSTANCE HAS A CERTAIN MELTING POINT AND WHICH IMPURITIES HAVE MELTING POINTS DIFFERENT FROM SAID SUBSTANCE AND DIFFERENT FROM ONE ANOTHER, WHICH METHOD INCLUDES THE STEP OF PROVIDING A SOLID CHARGE OF THE SUBSTANCE TO BE TREATED, PROVIDING A LIQUID REGION OF THE SUBSTANCE IN CONTACT WITH SAID SOLID CHARGE, WITH THE SUBSTANCE AND THE ALLOYING IMPURITIES EXISTING IN AN EQUILIBRIUM STATE BETWEEN THE LIQUID AND THE SOLID REGIONS AND WITH THE IMPURITIES HAVING DIFFERENT CONCENTRATION RATIOS BETWEEN SAID LIQUID AND SOLID REGIONS, PROVIDING A SELECTED ALLOYING AGENT WHICH HAS THE PROPERTY OF ALLOYING WITH SAID IMPURITIES TO ALTER THE MELTING POINTS THEREOF, INTRODUCING SAID ALLOYING AGENT INTO SAID LIQUID REGION IN SUFFICIENT QUANTITY TO ALLOY WITH SAID IMPURITIES AND THEREBY ALTER THEIR MELTING POINTS, AND CAUSING SAID LIQUID REGION TO SWEEP ACROSS THE CHARGE OF THE SUBSTANCE TO BE TREATED SO THAT THE SUBSTANCE IS DISSOLVED INTO THE LEADING EDGE OF THE LIQUID REGION AND IS DEPOSITED FROM THE TRAILING EDGE THEREOF WITH DIFFERENT CONCENTRATIONS OF SAID IMPURITIES AS COMPARED WITH THE ORIGINAL CHARGE OF THE SUBSTANCE.
References Cited (Backward Citations)
FR1065523A
Cited
US2747971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |