US3474347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opeational amplifier
Assignee: Keithley Instruments LLC
•
Filing: 1967-09-26
•
Granted: 1969-10-21
•
Expires: 1987-09-26
Abstract
No abstract record available.
Inventors
- 👤 Julius Praglin
- 👤 Robert C Kime Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:55
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3069; H03F3/3071; H03F1/00; H03F1/08; H03F1/083; H03F1/52; H03F3/34; H03F3/343; H03F3/345; H03F3/45; H03F3/45071
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |