US3426207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focused optical heterodyne system
Assignee: Boeing North American Inc
•
Filing: 1964-06-17
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Granted: 1969-02-04
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Expires: 1984-06-17
Abstract
No abstract record available.
Inventors
- 👤 David L Fried
- 👤 Wendell S Read
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:46
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; G; G02; G02F; G02F2/00; G02F2/002; H04B10/61; H04B10/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A HETERODYNE DETECTOR COMPRISING: MEANS FOR FOCUSING A BEAM OF COHERENT LIGHT OF A FIRST FREQUENCY INTO AN AIRY DISK AT A FOCAL PLANE; MEANS FOR IMPINGING AN UNFOCUSED BEAM OF COHERENT LIGHT OF A SECOND FREQUENCY ON THE FOCAL PLANE; AND MEANS AT THE FOCAL PLANE FOR DETECTING A HETERODYNE FREQUENCY BETWEEN THE FOCUSED BEAM OF LIGHT AND THE UNFOCUSED BEAM OF LIGHT, INCLUDING MEANS FOR EXCLUDING A PORTION OF THE UNFOCUSED BEAM OF LIGHT FROM SAID MEANS FOR DETECTING.
Claim 2
Dependent Claim
81 words
A HETERODYNE DETECTOR COMPRISING: MEANS FOR FOCUSING A BEAM OF COHERENT LIGHT OF A FIRST FREQUENCY INTO AN AIRY DISK AT A FOCAL PLANE; MEANS FOR IMPINGING AN UNFOCUSED BEAM OF COHERENT LIGHT OF A SECOND FREQUENCY ON THE FOCAL PLANE; AND MEANS AT THE FOCAL PLANE FOR DETECTING A HETERODYNE FREQUENCY BETWEEN THE FOCUSED BEAM OF LIGHT AND THE UNFOCUSED BEAM OF LIGHT, INCLUDING MEANS FOR EXCLUDING A PORTION OF THE UNFOCUSED BEAM OF LIGHT FROM SAID MEANS FOR DETECTING.
References Cited (Backward Citations)
US2967247A
Cited
US3083299A
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US3149235A
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US3170122A
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US3218390A
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US3240942A
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US3231741A
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US3215840A
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US3229095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |