US3419809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable d.c. amplifier
Assignee: RTX Corp
•
Filing: 1967-07-17
•
Granted: 1968-12-31
•
Expires: 1987-07-17
Abstract
No abstract record available.
Inventors
- 👤 Richard F Lach
- 👤 Henry E Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:06
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/26; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3188576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |