US3268895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio range finders
Assignee: BAE Systems Electronics Ltd
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Filing: 1956-07-12
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Granted: 1966-08-23
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Expires: 1976-07-12
Abstract
No abstract record available.
Inventors
- 👤 Dering Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:10
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S3/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A RADIO RANGE FINDER COMPRISING AN INNER AERIAL AND TWO OUTER AERIALS WHICH ARE SPACED APART; A MIXER CON NECTED TO COMBINE SIGNALS DERIVED FROM THE TWO OUTER AERIALS TO PRODUCE A SIGNAL OF TWICE THE FREQUENCY OF THAT DERIVED FROM SAID OUTER AERIALS; A FREQUENCY DOUBLER CONNECTED AND ARRANGED TO DOUBLE THE FREUENCY OF A SIMILAR FREQUENCY SIGNAL DERIVED FROM THE INNER AERIAL; A MULTIPLICATIVE MIXER OR CO-RELATION DETECTOR FED IN PHASE WITH THE DOUBLED FREQUENCIES FROM SAID FIRST MENTIONED MIXER AND FROM SAID FREQUENCY DOUBLER; A FURTHER MULTIPLICATIVE MIXER OR CO-RELATION DETECTOR FED WITH THE DOUBLED FREQUENCIES FROM SAID FIRST MENTIONED MIXER AND FROM SAID FREQUENCIES DOUBLER IN PHASE QUADRATURE; AND RANGE INDICATING MEANS RESPONSIVE DIFFERENTIALLY TO THE OUTPUTS FROM THE TWO MULTIPLICATIVE MIXERS OR DETECTORS.
Claim 2
Dependent Claim
128 words
A RADIO RANGE FINDER COMPRISING AN INNER AERIAL AND TWO OUTER AERIALS WHICH ARE SPACED APART; A MIXER CON NECTED TO COMBINE SIGNALS DERIVED FROM THE TWO OUTER AERIALS TO PRODUCE A SIGNAL OF TWICE THE FREQUENCY OF THAT DERIVED FROM SAID OUTER AERIALS; A FREQUENCY DOUBLER CONNECTED AND ARRANGED TO DOUBLE THE FREUENCY OF A SIMILAR FREQUENCY SIGNAL DERIVED FROM THE INNER AERIAL; A MULTIPLICATIVE MIXER OR CO-RELATION DETECTOR FED IN PHASE WITH THE DOUBLED FREQUENCIES FROM SAID FIRST MENTIONED MIXER AND FROM SAID FREQUENCY DOUBLER; A FURTHER MULTIPLICATIVE MIXER OR CO-RELATION DETECTOR FED WITH THE DOUBLED FREQUENCIES FROM SAID FIRST MENTIONED MIXER AND FROM SAID FREQUENCIES DOUBLER IN PHASE QUADRATURE; AND RANGE INDICATING MEANS RESPONSIVE DIFFERENTIALLY TO THE OUTPUTS FROM THE TWO MULTIPLICATIVE MIXERS OR DETECTORS.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |