US3234494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferromagnetic compound and devices including elements thereof
Assignee: AT&T Inc
•
Filing: 1961-07-28
•
Granted: 1966-02-08
•
Expires: 1981-07-28
Abstract
No abstract record available.
Inventors
- 👤 Bernd T Matthias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:07
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0311; H01F1/0313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
CIRCUIT ELEMENT COMPRISING A BODY CONSISTING ESSENTAILLY OF EUROPIUM OXIDE (EUO) IN ITS FERROMAGNETIC STATE TOGETHER WITH MEANS FOR MAINTAINING THE BODY AT A TEMPERATURE BELOW 77 DEGREES KELVIN.
Claim 2
Dependent Claim
29 words
CIRCUIT ELEMENT COMPRISING A BODY CONSISTING ESSENTAILLY OF EUROPIUM OXIDE (EUO) IN ITS FERROMAGNETIC STATE TOGETHER WITH MEANS FOR MAINTAINING THE BODY AT A TEMPERATURE BELOW 77 DEGREES KELVIN.
References Cited (Backward Citations)
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US2922125A
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US2994045A
Cited
US2974568A
Cited
US3016495A
Cited
US3050643A
Cited
US3016497A
Cited
US2981688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |