Patent US3418603A successfully refreshed from Google Patents.
US3418603A
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US
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Differential circuit, especially for reading magnetic-layer storage systems
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1965-01-26
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Granted: 1968-12-24
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Expires: 1985-01-26
Abstract
No abstract record available.
Inventors
- 👤 Alexandre Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:33
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/04; H01F19/06; G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; H03; H03H; H03H2/00; H03H2/005; H03H2/008; H03H7/00; H03H7/42; H03H7/422; H01F27/00; H01F27/28; H01F27/2823; H01F2027/2833
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |