US3824573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bubble resonance sensor
Assignee: Individual
•
Filing: 1973-07-19
•
Granted: 1974-07-16
•
Expires: 1993-07-19
Abstract
Abstract A magnetic sensor to sense the presence or absence of a bubble domain at selected locations in a magnetic bubble memory or logic element, employing magnetic resonance phenomena to sense the bubble domain.
Inventors
- 👤 J Scarzello
- 👤 R Sery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:53
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A magnetic device having cylindrical magnetic domains, comprising: a magnetic medium in which said domains are propagated; an alternating field applied parallel to said medium; sensing means for detecting the presence or absence of said domains in the vicinity of said sensing means, including conductive means for sensing a change in the absorption in said medium of said alternating field.
Claim 2
Dependent Claim
60 words
A magnetic device having cylindrical magnetic domains, comprising: a magnetic medium in which said domains are propagated; an alternating field applied parallel to said medium; sensing means for detecting the presence or absence of said domains in the vicinity of said sensing means, including conductive means for sensing a change in the absorption in said medium of said alternating field.
Claim 3
Dependent Claim
32 words
A magnetic device as recited in claim 1 wherein: said alternating field is a radio frequency field resonantly absorbed by said cylindrical domains, and wherein said conductive means comprises a pick-up coil.
Claim 4
Dependent Claim
24 words
A magnetic device as recited in claim 2 wherein said coils are driven by an a.c. source whereby said coil develops said alternating field.
Claim 5
Dependent Claim
17 words
A magnetic device as recited in claim 3 wherein said coil forms part of a marginal oscillator.
Claim 6
Dependent Claim
26 words
A magnetic device as recited in claim 4 wherein: said medium possesses uniaxial anisotropy perpendicular to its plane and wherein said cylindrical domains comprise bubble domains.
Claim 7
Dependent Claim
27 words
A magnetic device as recited in claim 5 wherein the frequency of said radio frequency is the same as the precessional frequency of the precessing magnetic moments.
Claim 8
Dependent Claim
51 words
In a magnetic bubble device containing bubble domains, means for detecting said domains comprising: means for applying an r.f. field resonantly absorbed by said bubble domains in the vicinity of said magnetic device, and a pick up coil for sensing a change in the absorption of said field in said device.
Claim 9
Dependent Claim
51 words
In a magnetic bubble device containing bubble domains, means for detecting said domains comprising: means for applying an r.f. field resonantly absorbed by said bubble domains in the vicinity of said magnetic device, and a pick up coil for sensing a change in the absorption of said field in said device.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |