US3786452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single wall domain generator
Assignee: AT&T Inc
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Filing: 1972-09-28
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Granted: 1974-01-15
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Expires: 1992-09-28
Abstract
Abstract The number of magnetic bubbles generated thermally by a pulsed laser beam has been found to be a function of the diameter of the beam leading to a useful bubble generator.
Inventors
- 👤 J Geusic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:33
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0858; G11C13/00; G11C13/04; G11C13/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
Apparatus comprising a layer of material in which single wall domains can be moved, and means for generating single wall domains at a localized input position in said layer, said lastmentioned means comprising means for applying to said input position heat energy for a time to heat said position to a first temperature at which the magnetization at said position is at about zero, and means responsive to external signals for changing the size of the heated area of said position in a manner for selectively generating different numbers of said domains there.
Claim 2
Dependent Claim
93 words
Apparatus comprising a layer of material in which single wall domains can be moved, and means for generating single wall domains at a localized input position in said layer, said lastmentioned means comprising means for applying to said input position heat energy for a time to heat said position to a first temperature at which the magnetization at said position is at about zero, and means responsive to external signals for changing the size of the heated area of said position in a manner for selectively generating different numbers of said domains there.
Claim 3
Dependent Claim
23 words
Apparatus in accordance with claim 1 wherein said layer is characterized by a Curie temperature and said first temperature is said Curie temperature.
Claim 4
Dependent Claim
37 words
Apparatus in accordance with claim 1 wherein said means for applying heat energy comprises a source of a pulsed laser beam and said means responsive to external signals comprises means for changing the diameter of said beam.
Claim 5
Dependent Claim
21 words
Apparatus in accordance with claim 3 also including means responsive to said external signals for changing the energy of said beam.
Claim 6
Dependent Claim
77 words
Apparatus comprising a layer of material in which single wall domains can exist, and means for generating single wall domains at a localized input position in said layer, said last-mentioned means comprising means for directing a pulsed laser beam at said input position, and means responsive to one-out-of-n external signals for changing the diameter of said beam to a selected one of n values in a manner to produce different numbers of said domains at said position.
Claim 7
Dependent Claim
77 words
Apparatus comprising a layer of material in which single wall domains can exist, and means for generating single wall domains at a localized input position in said layer, said last-mentioned means comprising means for directing a pulsed laser beam at said input position, and means responsive to one-out-of-n external signals for changing the diameter of said beam to a selected one of n values in a manner to produce different numbers of said domains at said position.
References Cited (Backward Citations)
US3624622A
Cited
US3676867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |