US3582778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave magnetic resonance spectrometers incorporating gunn-effect oscillators
Assignee: Brookdeal Electronics Ltd
•
Filing: 1969-02-25
•
Granted: 1971-06-01
•
Expires: 1989-02-25
Abstract
Abstract A microwave magnetic resonance spectrometer comprises a cavity in which a specimen is placed and which is energized from a Gunn diode. The cavity is subjected to a magnetic field having a steady component, an oscillatory component and a sweep component. Any electron spin resonance in a specimen absorbs microwave energy to alter the Q value of the cavity and this can be detected by a change in the amplitude of the microwave signal from the cavity.
Inventors
- 👤 Eric Andrew Faulkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:13
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A microwave resonance spectrometer comprising a selfoscillating cavity containing a Gunn-effect microwave generator mounted within the cavity for, when energized, causing the cavity to resonate, means for holding a specimen of material within the cavity, means for generating a magnetic field having an oscillatory component in the region of the specimen, and means for detecting the resultant oscillatory changes in amplitude of the microwave energy in the cavity.
Claim 2
Dependent Claim
68 words
A microwave resonance spectrometer comprising a selfoscillating cavity containing a Gunn-effect microwave generator mounted within the cavity for, when energized, causing the cavity to resonate, means for holding a specimen of material within the cavity, means for generating a magnetic field having an oscillatory component in the region of the specimen, and means for detecting the resultant oscillatory changes in amplitude of the microwave energy in the cavity.
Claim 3
Dependent Claim
52 words
The spectrometer as claimed in claim 1 in which the Gunn-effect generator is mounted in a conducting post positioned at one end of the cavity and the post is insulated from the cavity for direct current to enable an operating electrical potential to be applied through the post across the Gunn-effect generator.
Claim 4
Dependent Claim
40 words
The spectrometer as claimed in claim 2 in which the means for generating the magnetic field having an oscillatory component includes a wire loop surrounding the location of the specimen and an oscillatory current generator coupled to the wire loop.
Claim 5
Dependent Claim
56 words
The spectrometer as claimed in claim 4 in which the detecting means comprises a crystal detEctor positioned to receive microwave energy which leaks from said cavity past said post and a phase-sensitive rectifier the signal input to which is derived from the detector and the reference input to which is derived from the oscillatory current generator.
Claim 6
Dependent Claim
24 words
The spectrometer as claimed in claim 1 in which the magnetic field includes a relatively slow sweep component in addition to the oscillatory component.
Claim 7
Dependent Claim
14 words
The spectrometer as claimed in claim 5 in which the sweep component is repetitive.
References Cited (Backward Citations)
US3080520A
Cited
US3439290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |