Patent US2855335A successfully refreshed from Google Patents.
US2855335A
Expired / Lapsed
US
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Method of purifying semiconductor material
Assignee: International Standard Electric Corp
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Filing: 1956-01-11
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Granted: 1958-10-07
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Expires: 1976-01-11
Abstract
No abstract record available.
Inventors
- 👤 Seller Karl Otto
- 👤 Muller Siegfried Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:24
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; Y; Y10; Y10T; Y10T117/00; Y10T117/10
Claims Analysis
Total Claims: 0
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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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |