Patent US3093827A successfully refreshed from Google Patents.
US3093827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three loop direction finder antenna for shipboard use
Assignee: Individual
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Filing: 1959-12-11
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Granted: 1963-06-11
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Expires: 1979-12-11
Abstract
No abstract record available.
Inventors
- 👤 Douglas N Travers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:45
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/04; G01S3/08; G01S3/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A THREE LOOP DIRECTION FINDER ANTENNA SYSTEM COMPRISING A PAIR OF COAXIAL SPACED LOOP ANTENNAS HAVING A CROSS-CONNECTED OUTPUT, A SENSE LOOP ANTENNA MOUNTED AT A RIGHT ANGLE TO SAID SPACED LOOP ANTENNAS AND HAVING AN OUTPUT, A PHASE SHIFT AMPLIFIER CONNECTED TO SAID SENSE LOOP OUTPUT AND HAVING A SUBSTANTIALLY CAPACITIVE LOAD TO PROVIDE A 90* PHASE SHIFT, AN ISOLATING AMPLIFIER CONNECTED TO SAID PHASE SHIFT AMPLIFIER AND HAVING AN OUTPUT, TUNING MEANS CONNECTED BETWEEN SAID SPACED LOOP OUTPUT AND SAID ISOLATING AMPLIFIER OUTPUT FOR MIXING SAID SENSE LOOP AND SPACED LOOP OUT OUTPUT AND TO PROVIDE A SUBSTANTIALLY RESISTIVE LOAD TO SAID ISOLATING AMPLIFIER, A RECEIVER FOR DISPLAYING THE RESPONSE OF SAID ANTENNAS, AND A CATHODE FOLLOWER CONNECTED BETWEEN SAID TUNING MEANS AND SAID RECEIVER.
Claim 2
Dependent Claim
127 words
A THREE LOOP DIRECTION FINDER ANTENNA SYSTEM COMPRISING A PAIR OF COAXIAL SPACED LOOP ANTENNAS HAVING A CROSS-CONNECTED OUTPUT, A SENSE LOOP ANTENNA MOUNTED AT A RIGHT ANGLE TO SAID SPACED LOOP ANTENNAS AND HAVING AN OUTPUT, A PHASE SHIFT AMPLIFIER CONNECTED TO SAID SENSE LOOP OUTPUT AND HAVING A SUBSTANTIALLY CAPACITIVE LOAD TO PROVIDE A 90* PHASE SHIFT, AN ISOLATING AMPLIFIER CONNECTED TO SAID PHASE SHIFT AMPLIFIER AND HAVING AN OUTPUT, TUNING MEANS CONNECTED BETWEEN SAID SPACED LOOP OUTPUT AND SAID ISOLATING AMPLIFIER OUTPUT FOR MIXING SAID SENSE LOOP AND SPACED LOOP OUT OUTPUT AND TO PROVIDE A SUBSTANTIALLY RESISTIVE LOAD TO SAID ISOLATING AMPLIFIER, A RECEIVER FOR DISPLAYING THE RESPONSE OF SAID ANTENNAS, AND A CATHODE FOLLOWER CONNECTED BETWEEN SAID TUNING MEANS AND SAID RECEIVER.
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) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |