US3775670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High bandwidth - time product spin echo system
Assignee: Westinghouse Electric Corp
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Filing: 1970-04-30
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Granted: 1973-11-27
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Expires: 1990-04-30
Abstract
Abstract A system for the generation of a spin-echo signal utilizing a paramagnetic sample of titanium dioxide (rutile) selectively doped with nickel wherein the crystalline electric field of the rutile doped with nickel splits the energy level of the nickel at a predetermined frequency (8.25GHz) and spin-echo signals are produced without the requirement of an external magnetic field.
Inventors
- 👤 D Bozanic
- 👤 D Mergerian
- 👤 R Minarik
- 👤 P Pincoffs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:15
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/60; G01R33/44; G01R33/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
23 words
The invention as defined by claim 1 wherein said cryogenic temperature is substantially in the region of From 1.2* K to 4.2* K.
Claim 2
Dependent Claim
32 words
The invention as defined by claim 2 and wherein said microwave transmission line means comprises a section of waveguide terminated in a load and including means for locating said spin-echo sample therein.
Claim 3
Independent Claim
97 words
The method of increasing the dynamic range and repetition rate of a spin-echo signal comprising the steps of: positioning a rutile spin-echo sample doped with nickel ions, the concentration of said nickel ions being selected to give the desired bandwidth and phase memory time within a microwave transmission line, said sample being subjected to substantially zero steady state magnetic field; lowering the temperature of said spin-echo sample to a predetermined cryogenic temperature; and applying a first and a second pulse of RF energy to said spin-echo sample in a predetermined timed relationship to produce a spin-echo signal.
Claim 4
Dependent Claim
41 words
The method as defined by claim 4 wherein said sample is doped by immersing said sample in a nickel oxide powder and heating it to 1100* C in air for a predetermined length of time, said time determining the doping concentration.
Claim 5
Dependent Claim
43 words
The method as defined by claim 5 wherein said step of applying a first and a second pulse of RF energy comprises applying a first and a second pulse of RF energy at an operating frequency in the region of and including 8.25GHz.
Claim 6
Dependent Claim
22 words
The method as defined by claim 6 wherein said predetermined cryogenic temperatures is in the range including 1.2* Kelvin and 4.2* Kelvin.
References Cited (Backward Citations)
US3324461A
Cited
US3671855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |