US3376397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pole piece for magnetic recording head
Assignee: US Philips Corp
•
Filing: 1965-04-09
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Granted: 1968-04-02
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Expires: 1985-04-09
Abstract
No abstract record available.
Inventors
- 👤 Willem
- 👤 Thijssen Jan Bertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/235; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; G11B5/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
AS AN ARTICLE OF MANUFACTURE A BODY OF SINTERED OXIDIC FERROMAGNETIC MATERIAL WHICH IS JOINED TO A BODY CONSISTING OF A NON-MAGNETIZABLE ELECTRICALLY NON-CONDUCTIVE MATERIAL CONSISTING OF AT LEAST 30% BY WEIGHT OF A COMPOUND HAVING THE FORMULA (BAUQQV) (TIXRY) O20, IN WHICH Q IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF SR AND ZN AND R IS AN ELEMENT SELECTED FROM THE GROUP
Claim 2
Dependent Claim
65 words
AS AN ARTICLE OF MANUFACTURE A BODY OF SINTERED OXIDIC FERROMAGNETIC MATERIAL WHICH IS JOINED TO A BODY CONSISTING OF A NON-MAGNETIZABLE ELECTRICALLY NON-CONDUCTIVE MATERIAL CONSISTING OF AT LEAST 30% BY WEIGHT OF A COMPOUND HAVING THE FORMULA (BAUQQV) (TIXRY) O20, IN WHICH Q IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF SR AND ZN AND R IS AN ELEMENT SELECTED FROM THE GROUP
References Cited (Backward Citations)
US3292062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |