Patent US2820720A successfully refreshed from Google Patents.
US2820720A
Expired / Lapsed
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Glass-bonded ferrite
Assignee: Raytheon Co
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Filing: 1954-09-15
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Granted: 1958-01-21
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Expires: 1974-09-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Iversen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:37
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; H01F1/37; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A GLASS-BONDED FERRITE STRUCTURE COMPRISING A FERRITE BODY, A SINTERED SUBSTANTIALLY NON-POROUS LAYER OF A DIELECTRIC FERRITE POWDER BEING LESS THAN 5 MICRONS IN PARTICLE SIZE AND DISPOSED ON THE EXTERNAL SURFACE OF SAID FERRITE BODY, AND A SOFT GLASS FUSED OVER SAID SINTERED LAYER OF FERRITE POWDER.
Claim 2
Dependent Claim
48 words
A GLASS-BONDED FERRITE STRUCTURE COMPRISING A FERRITE BODY, A SINTERED SUBSTANTIALLY NON-POROUS LAYER OF A DIELECTRIC FERRITE POWDER BEING LESS THAN 5 MICRONS IN PARTICLE SIZE AND DISPOSED ON THE EXTERNAL SURFACE OF SAID FERRITE BODY, AND A SOFT GLASS FUSED OVER SAID SINTERED LAYER OF FERRITE POWDER.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |