US2945919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite magnetic heads
Assignee: Siemens and Halske AG
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Filing: 1956-01-19
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Granted: 1960-07-19
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Expires: 1976-01-19
Abstract
No abstract record available.
Inventors
- 👤 Neumann Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:08
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/193; 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
60 words
A FERRITE MAGNETIC HEAD FOR OPERATION WITHIN A WIDE FREQUENCY RANGE COMPRISING A PAIR OF FERRITE CERAMIC MEMBERS HAVING LATERAL OPPOSING GAP SURFACES, WHEREIN FISSURES AND CREVIES OF SAID FERRITE CERAMIC GAP SURFACES ARE FILLED BY GAP-DEFINING LAYERS OF A FINELY GRANULAR FERROMAGNETIC MATERIAL OF A PERMEABILITY WHICH IS SUBSTANTIALLY EQUAL TO OR HIGHER THAN THAT OF THE SAID MEMBERS.
Claim 2
Dependent Claim
60 words
A FERRITE MAGNETIC HEAD FOR OPERATION WITHIN A WIDE FREQUENCY RANGE COMPRISING A PAIR OF FERRITE CERAMIC MEMBERS HAVING LATERAL OPPOSING GAP SURFACES, WHEREIN FISSURES AND CREVIES OF SAID FERRITE CERAMIC GAP SURFACES ARE FILLED BY GAP-DEFINING LAYERS OF A FINELY GRANULAR FERROMAGNETIC MATERIAL OF A PERMEABILITY WHICH IS SUBSTANTIALLY EQUAL TO OR HIGHER THAN THAT OF THE SAID MEMBERS.
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) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |