US3458832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulk negative conductivity semiconductor oscillator
Assignee: International Business Machines Corp
•
Filing: 1967-08-14
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Granted: 1969-07-29
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Expires: 1987-08-14
Abstract
No abstract record available.
Inventors
- 👤 James C Mcgroddy
- 👤 Marshall I Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:04
CPC Classifications
H; H10; H10N; H10N80/00; H03; H03B; H03B9/00; H03B9/12; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/853; Y10S505/854
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |