Patent US3530308A successfully refreshed from Google Patents.
US3530308A
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Signal attenuating circuit using transistor with direct current isolated collector and nonlinear base input compensation
Assignee: International Business Machines Corp
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Filing: 1969-06-05
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Granted: 1970-09-22
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Expires: 1989-06-05
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Pawletko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:27
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06V; G06V30/00; G06V30/10; G06V30/22; G06V30/224; G06V30/2247; H; H03; H03F; H03F1/00; H03F1/32; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0082; H03G3/00; H03G3/20; H03G3/30
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) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |