Patent US3520810A successfully refreshed from Google Patents.
US3520810A
Expired / Lapsed
US
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Manufacture of single crystal semiconductors
Assignee: International Business Machines Corp
•
Filing: 1968-01-15
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Granted: 1970-07-21
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Expires: 1988-01-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas S Plaskett
- 👤 Jerry M Woodall
- 👤 William C Wuestenhoefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:31
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/14; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902; Y10S148/00; Y10S148/022; Y10S148/107; Y10S148/115
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3245847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |