US3446653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of silicon of high purity
Assignee: Siemens AG
•
Filing: 1965-10-21
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Granted: 1969-05-27
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Konrad Reuschel
- 👤 Norbert Schink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 02:40
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/02; C30B29/06; C01; C01B; C01B33/00; C01B33/02; C30B11/00; C30B11/04; C30B11/06; C30B13/00; C30B13/08; C30B13/10; C30B15/00; H; H10; H10P; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/016; Y10S148/049; Y10S148/06; Y10S148/097; Y10S148/107; Y10S148/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3173765A
Cited
US2851342A
Cited
US3366516A
Cited
US3192072A
Cited
US3129061A
Cited
US3243323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |