US3428761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excitation and detection circuitry for a flux responsive magnetic head
Assignee: National Aeronautics and Space Administration
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Filing: 1966-04-26
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Granted: 1969-02-18
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Expires: 1986-04-26
Abstract
No abstract record available.
Inventors
- 👤 David A Ehrenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/335
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A CIRCUIT FOR USE WITH A FLUX RESPONSIVE MAGNETIC REPRODUCTION HEAD HAVING AN EXCITATION WINDING AND A SIGNAL WINDING WOUND THEREABOUT AND DEFINING A GAP FOR PROVIDING AN OUTPUT SIGNAL IN RESPONSE TO AN EXCITATION SIGNAL IN SAID EXCITATION WINDING AS A FUNCTION OF MAGNETIC FLUX IN A MAGNETIC MEMBER ADJACENT SAID GAP, SAID CIRCUIT COMPRISING: A SOURCE OF EXCITATION SIGNALS OF A PRESELECTED EXCITATION FREQUENCY; FIRST MEANS FOR SUPPLYING SAID EXCITATION SIGNALS TO THE EXCITATION WINDING OF SAID HEAD; SECOND MEANS FOR DEFINING SUCCESSIVE SAMPLING PERIODS AT A PREDETERMINED SAMPLING FREQUENCY; THIRD MEANS FOR LIMITING THE SUPPLY OF SAID EXCITATION SIGNALS TO SAID EXCITATION WINDING TO SAID SAMPLING PERIODS; AND OUTPUT MEANS FOR DETECTING THE OUTPUT SIGNALS INDUCED IN SAID SIGNAL WINDING DURING SAID SAMPLING PERIODS.
Claim 2
Dependent Claim
127 words
A CIRCUIT FOR USE WITH A FLUX RESPONSIVE MAGNETIC REPRODUCTION HEAD HAVING AN EXCITATION WINDING AND A SIGNAL WINDING WOUND THEREABOUT AND DEFINING A GAP FOR PROVIDING AN OUTPUT SIGNAL IN RESPONSE TO AN EXCITATION SIGNAL IN SAID EXCITATION WINDING AS A FUNCTION OF MAGNETIC FLUX IN A MAGNETIC MEMBER ADJACENT SAID GAP, SAID CIRCUIT COMPRISING: A SOURCE OF EXCITATION SIGNALS OF A PRESELECTED EXCITATION FREQUENCY; FIRST MEANS FOR SUPPLYING SAID EXCITATION SIGNALS TO THE EXCITATION WINDING OF SAID HEAD; SECOND MEANS FOR DEFINING SUCCESSIVE SAMPLING PERIODS AT A PREDETERMINED SAMPLING FREQUENCY; THIRD MEANS FOR LIMITING THE SUPPLY OF SAID EXCITATION SIGNALS TO SAID EXCITATION WINDING TO SAID SAMPLING PERIODS; AND OUTPUT MEANS FOR DETECTING THE OUTPUT SIGNALS INDUCED IN SAID SIGNAL WINDING DURING SAID SAMPLING PERIODS.
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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |