Patent US3638207A successfully refreshed from Google Patents.
US3638207A
Expired / Lapsed
US
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Magnetic devices
Assignee: AT&T Inc
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Filing: 1969-11-17
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Granted: 1972-01-25
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Expires: 1989-11-17
Abstract
Abstract Partial substitution of small amounts of cobalt in a class of materials, sometimes referred to as hexagonal ferrites, produces marked changes in anisotropy. This, in turn, results in an increase in domain wall mobility or in other characteristic changes of device interest. A leading class of such devices is known as ''''bubble'''' or single-wall domain devices.
Inventors
- 👤 David H Smith
- 👤 Le Grand G Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2633; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/205
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
Device of claim 1 in which the cobalt content is from 2 ion percent to 15 ion percent.
Claim 2
Dependent Claim
18 words
A device of claim 1 where the cobalt content is from 3 ion percent to 10 ion percent.
Claim 3
Dependent Claim
16 words
Device of claim 1 in which the said composition is normally possessed of uniaxial magnetic anisotropy.
References Cited (Backward Citations)
US2955085A
Cited
US2960471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |