US3518564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low level,low offset,high frequency preamplifier chopper circuit
Assignee: RTX Corp
•
Filing: 1968-04-22
•
Granted: 1970-06-30
•
Expires: 1988-04-22
Abstract
No abstract record available.
Inventors
- 👤 John E Games
- 👤 Richard F Lach
- 👤 James P Towey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:14
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/387
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3408542A
Cited
US3317758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |