Patent US3221328A successfully refreshed from Google Patents.
US3221328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sum-difference direction-finding device
Assignee: Siemens Schweiz AG
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Filing: 1962-11-15
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Granted: 1965-11-30
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Expires: 1982-11-15
Abstract
No abstract record available.
Inventors
- 👤 Isch Hans Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:48
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4436; G01S13/4409; G01S13/4427; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4021; G01S7/4052; G01S7/406; G01S7/4069
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A SUM-DIFFERENCE TYPE MONOPULSE RADAR LOCATING APPARATUS COMPRISING, IN COMBINATION A PLURALITY OF PRIMARY TRANSMITTING AND RECEIVING ANTENNAS; MEANS FOR SUPPLYING GENERATED RADIO ENERGY TO SAID ANTENNAS AT A PRESELECTED FREQUENCY; A REFLECTOR SPACED FROM SAID PRIMARY ANTENNAS AND FOCUSING RECEIVED RADIO ENERGY TO SAID PRIMARY ANTENNAS; A RECEIVED ENERGY COMPARISON NETWORK CONNECTED TO SAID PRIMAY ATENNAS TO PROVIDE A SUM SIGNAL AND TWO DIFFERENCE SIGNALS AT THE OUTLET PORTS OF SAID COMPARISON NETWORI; AN AUXILIARY ANTENNA MOUNTED WITHIN SAID REFLECTOR AND FACING SAID PRIMARY ANTENNAS; MEANS FOR SUPPLYING ENERGY TO SAID AUXILIARY ANTENNA AT A FREQUENCY CORRESPONDING TO THE SUPPLY OF GENERATED RADIO ENERGY TO SAID ANTENNAS, FOR SAID AUXILIARY ANTENNA TO RADIATE A CALIBRATING SIGNAL TO ALL OF SAID PRIMARY ANTENNAS; SAID AUXILIARY ANTENNA BEING SO POSITIONED WITHIN SAID REFLECTOR WITH RESPECT TO SAID PRIMARY ANTENNAS THAT THE ENERGY RADIATED BY SAID AUXILIARY ANTENNA AND RECEIVED BY SID PRIMARY ANTENNAS GENERATES, IN SAID COMPARISON NETWORK, SUMMATION AND DIFFERENCE SIGNALS WHICH ARE OF SUBSTANTIALLY EQUAL PHASE AT THE OUTLET PORTS OF SAID COMPARISON NETWORK.
Claim 2
Dependent Claim
175 words
A SUM-DIFFERENCE TYPE MONOPULSE RADAR LOCATING APPARATUS COMPRISING, IN COMBINATION A PLURALITY OF PRIMARY TRANSMITTING AND RECEIVING ANTENNAS; MEANS FOR SUPPLYING GENERATED RADIO ENERGY TO SAID ANTENNAS AT A PRESELECTED FREQUENCY; A REFLECTOR SPACED FROM SAID PRIMARY ANTENNAS AND FOCUSING RECEIVED RADIO ENERGY TO SAID PRIMARY ANTENNAS; A RECEIVED ENERGY COMPARISON NETWORK CONNECTED TO SAID PRIMAY ATENNAS TO PROVIDE A SUM SIGNAL AND TWO DIFFERENCE SIGNALS AT THE OUTLET PORTS OF SAID COMPARISON NETWORI; AN AUXILIARY ANTENNA MOUNTED WITHIN SAID REFLECTOR AND FACING SAID PRIMARY ANTENNAS; MEANS FOR SUPPLYING ENERGY TO SAID AUXILIARY ANTENNA AT A FREQUENCY CORRESPONDING TO THE SUPPLY OF GENERATED RADIO ENERGY TO SAID ANTENNAS, FOR SAID AUXILIARY ANTENNA TO RADIATE A CALIBRATING SIGNAL TO ALL OF SAID PRIMARY ANTENNAS; SAID AUXILIARY ANTENNA BEING SO POSITIONED WITHIN SAID REFLECTOR WITH RESPECT TO SAID PRIMARY ANTENNAS THAT THE ENERGY RADIATED BY SAID AUXILIARY ANTENNA AND RECEIVED BY SID PRIMARY ANTENNAS GENERATES, IN SAID COMPARISON NETWORK, SUMMATION AND DIFFERENCE SIGNALS WHICH ARE OF SUBSTANTIALLY EQUAL PHASE AT THE OUTLET PORTS OF SAID COMPARISON NETWORK.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |