Patent EP0166900A2 successfully refreshed from Google Patents.
US3188643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circularly polarized omnidirectional cone mounted spiral antenna
Assignee: University of Illinois at Urbana-Champaign
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Filing: 1960-12-29
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Granted: 1965-06-08
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Expires: 1980-12-29
Abstract
No abstract record available.
Inventors
- 👤 John D Dyson
- 👤 Paul E Mayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:46
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/08; H01Q11/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A BROADBAND ANTENNA COMPRISING AN EVEN NUMBER GREATER THAN 2 OF SUBSTANTIALLY IDENTICAL ELECTRICALLY CONDUCTING ELEMENTS WOUND SO AS TO LIE ON A CONICAL SURFACE HAVING AN INCLUDED CONE APEX ANGLE IN THE RANGE BETWEEN APPROXIMATELY 15* AND 20*, AT LEAST ONE OF SAID ELEMENTS BEING ELECTRICALLY INSULATED FROM THE REMAINDER, EACH OF SAID ELEMENTS HAVING AT LEAST ONE EDGE WHICH PROJECTED ON A PLANE PERPENDICULAR TO THE AXIS OF SAID CONICAL SURFACE IS SUBSTANTIALLY IN THE FORM OF A SPIRAL, SAID ELEMENTS BEING SYMMETRICALLY PLACED ABOUT THE AXIS OF SAID CONICAL SURFACE.
Claim 2
Dependent Claim
93 words
A BROADBAND ANTENNA COMPRISING AN EVEN NUMBER GREATER THAN 2 OF SUBSTANTIALLY IDENTICAL ELECTRICALLY CONDUCTING ELEMENTS WOUND SO AS TO LIE ON A CONICAL SURFACE HAVING AN INCLUDED CONE APEX ANGLE IN THE RANGE BETWEEN APPROXIMATELY 15* AND 20*, AT LEAST ONE OF SAID ELEMENTS BEING ELECTRICALLY INSULATED FROM THE REMAINDER, EACH OF SAID ELEMENTS HAVING AT LEAST ONE EDGE WHICH PROJECTED ON A PLANE PERPENDICULAR TO THE AXIS OF SAID CONICAL SURFACE IS SUBSTANTIALLY IN THE FORM OF A SPIRAL, SAID ELEMENTS BEING SYMMETRICALLY PLACED ABOUT THE AXIS OF SAID CONICAL SURFACE.
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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |