US3710256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave frequency memory device
Assignee: Lockheed Martin Tactical Systems Inc
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Filing: 1971-11-26
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Granted: 1973-01-09
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Expires: 1991-11-26
Abstract
Abstract A frequency memory device wherein the cycle by cycle waveform of a short pulse of microwave energy is recorded electro-optically. This recording is then read or played back over and over again thereby achieving a semi-continuous ''''tone'''' at the exact microwave frequency that was received. The device has a variety of uses, including the production of signals for ''''jamming'''' hostile radar.
Inventors
- 👤 M Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:00
CPC Classifications
H; H04; H04K; H04K3/00; H04K3/60; H04K3/68; G; G01; G01S; G01S7/00; G01S7/02; G01S7/38; H04K3/80; H04K3/82; H04K3/825; H04K2203/00; H04K2203/10; H04K2203/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
181 words
A microwave frequency memory device for creating a semicontinuous tone from a microwave tone burst at the exact microwave frequency that is received comprising: signal receiving means including a light-emitting diode element, a hollow cylinder having a phosphor coated inner surface, a rotating mirror element, and a photo sensitive detector element; said rotating mirror element having a principal axis of rotation, and a pair of reflective oppositely disposed surfaces positioned at 45* with respect to said axis, said surfaces being positioned within said phosphor coated surface with said axis of rotation substantially coaxially positioned with respect to the axis of curvature of said cylinder; said light-emitting diode element being positioned to cast light rays on one of said reflective surfaces, said photo sensitive detector element being positioned to receive light rays from the other of said reflective surfaces; whereby upon the reception of a microwave pulse, said light-emitting diode may record a series of luminous dots upon said phosphor coated surface to be read by said photo sensitive detector with rotation of said mirror element during the period of phosphor excitation.
Claim 2
Dependent Claim
181 words
A microwave frequency memory device for creating a semicontinuous tone from a microwave tone burst at the exact microwave frequency that is received comprising: signal receiving means including a light-emitting diode element, a hollow cylinder having a phosphor coated inner surface, a rotating mirror element, and a photo sensitive detector element; said rotating mirror element having a principal axis of rotation, and a pair of reflective oppositely disposed surfaces positioned at 45* with respect to said axis, said surfaces being positioned within said phosphor coated surface with said axis of rotation substantially coaxially positioned with respect to the axis of curvature of said cylinder; said light-emitting diode element being positioned to cast light rays on one of said reflective surfaces, said photo sensitive detector element being positioned to receive light rays from the other of said reflective surfaces; whereby upon the reception of a microwave pulse, said light-emitting diode may record a series of luminous dots upon said phosphor coated surface to be read by said photo sensitive detector with rotation of said mirror element during the period of phosphor excitation.
Claim 3
Dependent Claim
21 words
Structure in accordance with claim 1, in which said rotating mirror element is in the form of an air powered turbine.
Claim 4
Dependent Claim
41 words
Structure in accordance with claim 1, including a heterodyne circuit connected to said memory device to lower the frequency of a received signal for entry into the light-emitting diode, and reconverting the output of said detector to the original received frequency.
References Cited (Backward Citations)
US3548337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |