US3492502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bi-directional capacitive load driver
Assignee: International Business Machines Corp
•
Filing: 1967-07-14
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Granted: 1970-01-27
•
Expires: 1987-07-14
Abstract
No abstract record available.
Inventors
- 👤 David C Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:43
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/601
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3078395A
Cited
US3087047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |