US3500221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast response current amplifier
Assignee: Singer General Precision Inc
•
Filing: 1968-01-16
•
Granted: 1970-03-10
•
Expires: 1988-01-16
Abstract
No abstract record available.
Inventors
- 👤 Ernest C Mercier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:47
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3066; H03K; H03K6/00; H03K6/02; H03F2200/00; H03F2200/366
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3277385A
Cited
US3363191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |