Patent US3444472A successfully refreshed from Google Patents.
US3444472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sense amplifier circuit
Assignee: GTE Sylvania Inc
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Filing: 1967-06-12
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Granted: 1969-05-13
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Expires: 1987-06-12
Abstract
No abstract record available.
Inventors
- 👤 Brant T Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:49
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/284; H03F; H03F3/00; H03F3/189; H03F3/19; H03F3/195
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3189840A
Cited
US3370245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |