US3215840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image rejecting optical superheterodyne receiver
Assignee: Verizon Laboratories Inc
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Filing: 1962-11-23
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Granted: 1965-11-02
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Expires: 1982-11-23
Abstract
No abstract record available.
Inventors
- 👤 Carl F Buhrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/61; G; G02; G02F; G02F2/00; G02F2/002; H04B10/614; H04B10/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
AN OPTICAL RECEIVER FOR PRODUCING AN OUTPUT SIGNAL HAVING AN INTERMEDIATE FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN THE FREQUENCIES OF FIRST AND SECOND POLARIZED SIGNALS COMPRISING (A) MEANS FOR COMBINING SAID FIRST AND SECOND POLARIZED SIGNALS INTO FIRST AND SECOND COMPOSITE SIGNALS, EACH OF SAID COMPOSITE SIGNALS HAVING FIRST AND SECOND COMPONENTS CORRESPONDING TO SAID FIRST AND SECOND POLARIZED SIGNALS RESPECTIVELY, (B) PHASE SHIFTING MEANS FOR PRODUCING A PREDETERMINED ANGULAR PHASE DIFFERENCE (IN TIME) BETWEEN THE FIRST AND SECOND COMPONENTS OF SAID SECOND COMPOSITE SIGNAL, THE INSTANTANEOUS ANGULAR PHASE DIFFERENCE BETWEEN THE FIRST AND SECOND COMPONENTS OF SAID SECOND COMPOSITE SIGNAL DIFFERING BY 90* FROM THE INSTANTANEOUS ANGULAR PHASE DIFFERENCE BETWEEN THE FIRST AND SECOND COMPONENTS OF SAID FIRST COMPOSITE SIGNAL, AND (C) PHOTODETECTOR MEANS, SAID PHOTODETECTOR MEANS RECEIVING SAID FIRST AND SECOND COMPOSITE SIGNALS AND PRODUCING SAID OUTPUT SIGNAL.
Claim 2
Dependent Claim
140 words
AN OPTICAL RECEIVER FOR PRODUCING AN OUTPUT SIGNAL HAVING AN INTERMEDIATE FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN THE FREQUENCIES OF FIRST AND SECOND POLARIZED SIGNALS COMPRISING (A) MEANS FOR COMBINING SAID FIRST AND SECOND POLARIZED SIGNALS INTO FIRST AND SECOND COMPOSITE SIGNALS, EACH OF SAID COMPOSITE SIGNALS HAVING FIRST AND SECOND COMPONENTS CORRESPONDING TO SAID FIRST AND SECOND POLARIZED SIGNALS RESPECTIVELY, (B) PHASE SHIFTING MEANS FOR PRODUCING A PREDETERMINED ANGULAR PHASE DIFFERENCE (IN TIME) BETWEEN THE FIRST AND SECOND COMPONENTS OF SAID SECOND COMPOSITE SIGNAL, THE INSTANTANEOUS ANGULAR PHASE DIFFERENCE BETWEEN THE FIRST AND SECOND COMPONENTS OF SAID SECOND COMPOSITE SIGNAL DIFFERING BY 90* FROM THE INSTANTANEOUS ANGULAR PHASE DIFFERENCE BETWEEN THE FIRST AND SECOND COMPONENTS OF SAID FIRST COMPOSITE SIGNAL, AND (C) PHOTODETECTOR MEANS, SAID PHOTODETECTOR MEANS RECEIVING SAID FIRST AND SECOND COMPOSITE SIGNALS AND PRODUCING SAID OUTPUT SIGNAL.
References Cited (Backward Citations)
US2531951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |