US3177475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer with reduced pore volume adjacent the pole tips
Assignee: US Philips Corp
•
Filing: 1960-09-29
•
Granted: 1965-04-06
•
Expires: 1980-09-29
Abstract
No abstract record available.
Inventors
- 👤 Bos Jules
- 👤 Duinker Simon
- 👤 Stuijts Andreas Leopoldus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:01
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/342; G; G11; G11B; G11B5/00; G11B5/127; G11B5/133; G11B5/187; G11B5/193; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49034
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A MAGNETIC TRANSDUCER FOR CONVERTING ELECTRIC ENERGY TO MAGNETIC ENERGY AND VICE VERSA COMPRISING A SINTERED BODY OF FERROMAGNETIC FERRITE MATERIAL HAVING A CUBIC CRYSTAL STRUCTURE, A MAJOR PORTION OF SAID BODY HAVING A GIVEN PORE VOLUME, AND MEANS COUPLED TO SAID BODY FOR CONVERTING MAGNETIC ENERGY IN SAID BODY TO ELECTRIC ENERGY AND VICE VERSA, SAID BODY HAVING AN ACTIVE SURFACE ADAPTED TO BE COUPLED TO A MEDIUM FOR RECEIVING AND TRANSMITTING ENERGY TO SAID BODY, A PORTION OF SAID BODY IMMEDIATELY ADJACENT TO AND INCLUDING SAID SURFACE HAVING A PORE VOLUME WHICH IS SUBSTANTIALLY LESS THAN SAID GIVEN PORE VOLUME WHEREBY SAID SURFACE CAN BE SUBJECTED TO AGGRESSIVE MECHANICAL INFLUENCES WITHOUT SUBSTANTIAL DESTRUCTION THEREOF.
Claim 2
Dependent Claim
116 words
A MAGNETIC TRANSDUCER FOR CONVERTING ELECTRIC ENERGY TO MAGNETIC ENERGY AND VICE VERSA COMPRISING A SINTERED BODY OF FERROMAGNETIC FERRITE MATERIAL HAVING A CUBIC CRYSTAL STRUCTURE, A MAJOR PORTION OF SAID BODY HAVING A GIVEN PORE VOLUME, AND MEANS COUPLED TO SAID BODY FOR CONVERTING MAGNETIC ENERGY IN SAID BODY TO ELECTRIC ENERGY AND VICE VERSA, SAID BODY HAVING AN ACTIVE SURFACE ADAPTED TO BE COUPLED TO A MEDIUM FOR RECEIVING AND TRANSMITTING ENERGY TO SAID BODY, A PORTION OF SAID BODY IMMEDIATELY ADJACENT TO AND INCLUDING SAID SURFACE HAVING A PORE VOLUME WHICH IS SUBSTANTIALLY LESS THAN SAID GIVEN PORE VOLUME WHEREBY SAID SURFACE CAN BE SUBJECTED TO AGGRESSIVE MECHANICAL INFLUENCES WITHOUT SUBSTANTIAL DESTRUCTION THEREOF.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |