US3528405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low noise differential amplifier for measuring biological signals
Assignee: Canadian Patents and Development Ltd
•
Filing: 1967-04-10
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Granted: 1970-09-15
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Expires: 1987-04-10
Abstract
No abstract record available.
Inventors
- 👤 Graham Travers Schuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:20
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/181; H03F3/183; H03F3/45; H03F3/45071; H03F3/45479; Y; Y10; Y10S; Y10S128/00; Y10S128/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |