Patent US3549561A successfully refreshed from Google Patents.
US3549561A
Expired / Lapsed
US
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Method of producing electrically semiconductive material
Assignee: US Philips Corp
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Filing: 1969-07-22
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Granted: 1970-12-22
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Expires: 1989-07-22
Abstract
No abstract record available.
Inventors
- 👤 Willem Westerveld
- 👤 Jan Willem Harmsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:05
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; H01B; H01B1/00; H01B1/06; H01B1/08; H01C7/00; H01C7/001; H01C7/06
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) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |