Patent US2477267A successfully refreshed from Google Patents.
Patent US3171107A successfully refreshed from Google Patents.
US3171107A
Expired / Lapsed
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Wide-record narrow-read magnetic head
Assignee: International Business Machines Corp
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Filing: 1961-07-03
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Granted: 1965-02-23
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Expires: 1981-07-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Fred L Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:39
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/245; G11B5/2452; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A MAGNETIC HEAD FOR RECORDING AND READING INFORMATION ON A MAGNETIC RECORDING MEDIUM COMPRISING A MAGNETIC CORE HAVING A PAIR OF SPACED FACES PROVIDING A GAP, SAID FACES HAVING A PREDETERMINED WIDTH, A PAIR OF SPACED MAGNETIC MEMBERS DISPOSED BETWEEN SAID FACES IN SAID GAP AND EACH HAVING A WIDTH LESS THAN ONE-HALF OF SAID PREDETERMINED WIDTH, WHEREBY SAID MAMBERS ARE EFFECTIVE TO BYPASS A MAJOR PROPORTION OF MAGNETIC FLUX BETWEEN SAID FACES FOR MAGNETOMOTIVE FORCES LESS THAN A PREDETERMINED VALUE APPLIED TO SAID CORE AND TO SATURATE AND BYPASS A PROPORTION OF FLUX BETWEEN SAID FACES FOR MAGNETOMOTIVE FORCES SIGNIFICANTLY GREATER THAN SAID PREDETERMINED VALUE APPLIED TO SAID CORE.
Claim 2
Dependent Claim
110 words
A MAGNETIC HEAD FOR RECORDING AND READING INFORMATION ON A MAGNETIC RECORDING MEDIUM COMPRISING A MAGNETIC CORE HAVING A PAIR OF SPACED FACES PROVIDING A GAP, SAID FACES HAVING A PREDETERMINED WIDTH, A PAIR OF SPACED MAGNETIC MEMBERS DISPOSED BETWEEN SAID FACES IN SAID GAP AND EACH HAVING A WIDTH LESS THAN ONE-HALF OF SAID PREDETERMINED WIDTH, WHEREBY SAID MAMBERS ARE EFFECTIVE TO BYPASS A MAJOR PROPORTION OF MAGNETIC FLUX BETWEEN SAID FACES FOR MAGNETOMOTIVE FORCES LESS THAN A PREDETERMINED VALUE APPLIED TO SAID CORE AND TO SATURATE AND BYPASS A PROPORTION OF FLUX BETWEEN SAID FACES FOR MAGNETOMOTIVE FORCES SIGNIFICANTLY GREATER THAN SAID PREDETERMINED VALUE APPLIED TO SAID CORE.
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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |