US3265967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave plasma density measurement system
Assignee: Individual
•
Filing: 1965-06-08
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Granted: 1966-08-09
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Expires: 1985-06-08
Abstract
No abstract record available.
Inventors
- 👤 Mark A Heald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:25
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/0006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A FREQUENCY MODULATED MICROWAVE SYSTEM FOR MEASURING THE TIME VARYING DENSITY OF A PLASMA, COMPRISING PRODUCING FREQUENCY MODULATED MICROWAVES THAT ARE SPLIT INTO A SHORT PATH AND A LONG PATH CONTAINING SAID PLASMA AND JOINED TO PRODUCE AN INTERFERENCE SIGNAL CARRYING A PHASE MODULATION CORRESPONDING TO THE PHASE-SHIFT PRODUCED BY PASSING THE MICROWAVES THROUGH THE PLASMA, SAID INTERFERENCE SIGNAL HAVING ITS PRINCIPAL FOURIER COMPONENT AT THE HARMONIC N OF THE MODULATION FREQUENCY WHERE N REPRESENTS THE NUMBER OF INTERFERENCE CYCLES ARISING WHEN SAID SPLIT MICROWAVES ARE JOINED AS A RESULT OF THE FREQUENCY MODULATION EXCURSION OF THE MICROWAVES IN PASSING THROUGH SAID PLASMA, RECOVERING SAID FOURIER COMPONENT AND INTEGRATING IT TO PRODUCE A CONTINUOUS OUTPUT SIGNAL DIRECTLY CORRESPONDING TO SAID PLASMA DENSITY WHEN SAID PLASMA IS TRANSPARENT, WHILE INDICATING UNAMBIGUOUSLY WHEN THE PLASMA IS OPAQUE.
Claim 2
Dependent Claim
135 words
A FREQUENCY MODULATED MICROWAVE SYSTEM FOR MEASURING THE TIME VARYING DENSITY OF A PLASMA, COMPRISING PRODUCING FREQUENCY MODULATED MICROWAVES THAT ARE SPLIT INTO A SHORT PATH AND A LONG PATH CONTAINING SAID PLASMA AND JOINED TO PRODUCE AN INTERFERENCE SIGNAL CARRYING A PHASE MODULATION CORRESPONDING TO THE PHASE-SHIFT PRODUCED BY PASSING THE MICROWAVES THROUGH THE PLASMA, SAID INTERFERENCE SIGNAL HAVING ITS PRINCIPAL FOURIER COMPONENT AT THE HARMONIC N OF THE MODULATION FREQUENCY WHERE N REPRESENTS THE NUMBER OF INTERFERENCE CYCLES ARISING WHEN SAID SPLIT MICROWAVES ARE JOINED AS A RESULT OF THE FREQUENCY MODULATION EXCURSION OF THE MICROWAVES IN PASSING THROUGH SAID PLASMA, RECOVERING SAID FOURIER COMPONENT AND INTEGRATING IT TO PRODUCE A CONTINUOUS OUTPUT SIGNAL DIRECTLY CORRESPONDING TO SAID PLASMA DENSITY WHEN SAID PLASMA IS TRANSPARENT, WHILE INDICATING UNAMBIGUOUSLY WHEN THE PLASMA IS OPAQUE.
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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |