US3130368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic radiation monitor
Assignee: Unisys Corp
•
Filing: 1962-01-23
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Granted: 1964-04-21
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Expires: 1982-01-23
Abstract
No abstract record available.
Inventors
- 👤 John C Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:49
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/0864; G01R29/0878
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
AN ELECTROMAGNETIC RADIATION MONITOR COMPRISING A SPIRAL ANTENNA HAVING AN OUTER TURN WITH A PERIMETER EQUAL TO THE LONGEST WAVELENGTH IN THE NORMAL OPERATING RANGE, A FILTER COUPLED TO RECEIVE ENERGY FROM THE ANTENNA, SAID FILTER CONSTRUCTED AND ARRANGED TO INTRODUCE AN INSERTION LOSS THAT CHANGES IN PROPORTION TO CHANGES IN THE EFFECTIVE APERTURE OF SAID ANTENNA THROUGHOUT THE NORMAL OPERATING RANGE, SAID FILTER BEING FURTHER CONSTRUCTED AND ARRANGED TO PROVIDE A SUBSTANTIALLY CONSTANT INSERTION LOSS AT FREQUENCIES BELOW THE NORMAL OPERATING RANGE, AND A DETECTING MEANS COUPLED TO RECEIVE ENERGY FROM SAID FILTER.
Claim 2
Dependent Claim
94 words
AN ELECTROMAGNETIC RADIATION MONITOR COMPRISING A SPIRAL ANTENNA HAVING AN OUTER TURN WITH A PERIMETER EQUAL TO THE LONGEST WAVELENGTH IN THE NORMAL OPERATING RANGE, A FILTER COUPLED TO RECEIVE ENERGY FROM THE ANTENNA, SAID FILTER CONSTRUCTED AND ARRANGED TO INTRODUCE AN INSERTION LOSS THAT CHANGES IN PROPORTION TO CHANGES IN THE EFFECTIVE APERTURE OF SAID ANTENNA THROUGHOUT THE NORMAL OPERATING RANGE, SAID FILTER BEING FURTHER CONSTRUCTED AND ARRANGED TO PROVIDE A SUBSTANTIALLY CONSTANT INSERTION LOSS AT FREQUENCIES BELOW THE NORMAL OPERATING RANGE, AND A DETECTING MEANS COUPLED TO RECEIVE ENERGY FROM SAID FILTER.
References Cited (Backward Citations)
US2478311A
Cited
GB645818A
Cited
US2737629A
Cited
US2791686A
Cited
US2854643A
Cited
US2863145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |