Patent US3258597A successfully refreshed from Google Patents.
US3258597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser heterodyne communication system
Assignee: —
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Filing: —
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Granted: 1966-06-28
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Expires: 1983-06-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:17
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/61; H04B10/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
APPARATUS FOR OPTICALLY COMMUNICATING BETWEEN TWO POINTS, SAID APPARATUS COMPRISING: MEANS AT ONE POINT FOR TRANSMITTING A MODULATED FIRST LASER BEAM TO THE OTHER POINT; AND A RECEIVER SYSTEM AT SAID OTHER POINT FOR EXTRACTING THE MODULATION CONTENT FROM SAID MODULATED FIRST LASER BEAM, SAID RECEIVING SYSTEM INCLUDING LIGHT-SOURCE MEANS FOR PRODUCING AN UNMODULATED SECOND LASER BEAM, A PHOTOELECTRIC DEVICE HAVING NON-LINEAR DETECTION CHARACTERISTICS, FIRST MEANS FOR DIRECTING SAID FIRST AND SECOND LASER BEAMS TOWARD SAID PHOTOELECTRIC DEVICE ALONG SUBSTANTIALLY IDENTICAL PATHS OPTICALLY, AND SECOND MEANS INTERPOSED BETWEEN SAID FIRST MEANS AND SAID PHOTOELECTRIC DEVICE FOR FOCUSING SAID BEAMS ONTO THE SAME AREA OF SAID PHOTOELECTRIC DEVICE TO PRODUCE A CORRESPONDINGLY MODULATED INTERMEDIATE-FREQUENCY SIGNAL WHOSE FREQUENCY IS THE DIFFERENCE BETWEEN THE CARRIER FREQUENCY OF SAID FIRST LASER BEAM AND THE GENERATED FREQUENCY OF SAID SECOND LASER BEAM.
Claim 2
Dependent Claim
137 words
APPARATUS FOR OPTICALLY COMMUNICATING BETWEEN TWO POINTS, SAID APPARATUS COMPRISING: MEANS AT ONE POINT FOR TRANSMITTING A MODULATED FIRST LASER BEAM TO THE OTHER POINT; AND A RECEIVER SYSTEM AT SAID OTHER POINT FOR EXTRACTING THE MODULATION CONTENT FROM SAID MODULATED FIRST LASER BEAM, SAID RECEIVING SYSTEM INCLUDING LIGHT-SOURCE MEANS FOR PRODUCING AN UNMODULATED SECOND LASER BEAM, A PHOTOELECTRIC DEVICE HAVING NON-LINEAR DETECTION CHARACTERISTICS, FIRST MEANS FOR DIRECTING SAID FIRST AND SECOND LASER BEAMS TOWARD SAID PHOTOELECTRIC DEVICE ALONG SUBSTANTIALLY IDENTICAL PATHS OPTICALLY, AND SECOND MEANS INTERPOSED BETWEEN SAID FIRST MEANS AND SAID PHOTOELECTRIC DEVICE FOR FOCUSING SAID BEAMS ONTO THE SAME AREA OF SAID PHOTOELECTRIC DEVICE TO PRODUCE A CORRESPONDINGLY MODULATED INTERMEDIATE-FREQUENCY SIGNAL WHOSE FREQUENCY IS THE DIFFERENCE BETWEEN THE CARRIER FREQUENCY OF SAID FIRST LASER BEAM AND THE GENERATED FREQUENCY OF SAID SECOND LASER BEAM.
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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |