Patent US3077520A successfully refreshed from Google Patents.
US3077520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic pickup heads
Assignee: Consolidated Electrodynamics Corp
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Filing: 1961-05-22
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Granted: 1963-02-12
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Expires: 1981-05-22
Abstract
No abstract record available.
Inventors
- 👤 Lawrence T Fleming
- 👤 Robert K Willardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A MAGNETIC HEAD FOR USE IN AN EXTERNAL MAGNETIC FIELD, THE HEAD COMPRISING A YOKE OF MAGNETIC MATERIAL, THE YOKE HAVING A GAP ADAPTED TO BE DISPOSED ADJACENT A MAGNETIC RECORDING MEDIUM ON WHICH A MAGNETIC SIGNAL IS RECORDED, MEANS FOR PRODUCING A SIGNAL-DEPENDENT MAGNETIC FLUX IN THE YOKE, A PAIR OF HALL ELEMENTS DISPOSED IN THE SIGNAL-DEPENDENT MAGNETIC FLUX, EACH OF THE HALL ELEMENTS HAVING RESPECTIVE OUTPUT CONTACTS, AND MEANS CONNECTING THE OUTPUT CONTACTS TO PRODUCE ADDITIVE OUTPUT
Claim 2
Dependent Claim
79 words
A MAGNETIC HEAD FOR USE IN AN EXTERNAL MAGNETIC FIELD, THE HEAD COMPRISING A YOKE OF MAGNETIC MATERIAL, THE YOKE HAVING A GAP ADAPTED TO BE DISPOSED ADJACENT A MAGNETIC RECORDING MEDIUM ON WHICH A MAGNETIC SIGNAL IS RECORDED, MEANS FOR PRODUCING A SIGNAL-DEPENDENT MAGNETIC FLUX IN THE YOKE, A PAIR OF HALL ELEMENTS DISPOSED IN THE SIGNAL-DEPENDENT MAGNETIC FLUX, EACH OF THE HALL ELEMENTS HAVING RESPECTIVE OUTPUT CONTACTS, AND MEANS CONNECTING THE OUTPUT CONTACTS TO PRODUCE ADDITIVE OUTPUT
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) | 1966-02-11 | 1966-08-13 | 1967-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-11 | 1970-08-13 | 1971-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-11 | 1974-08-13 | 1975-02-12 | $7700.00 | Window Closed / Lapsed |