Patent US3204237A successfully refreshed from Google Patents.
US3204237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft station keeping and terminal navigation system
Assignee: Lockheed Martin Corp
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Filing: 1963-04-08
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Granted: 1965-08-31
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Expires: 1983-04-08
Abstract
No abstract record available.
Inventors
- 👤 Frank J Overcash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:39
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78; G01S13/781; G01S13/782
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
AN AIRCRAFT NAVIGATION SYSTEM FOR INDICATING A RELATIVE STATION RELATIONSHIP BETWEEN TWO AIRCRAFT IN FLIGHT FORMATION COMPRISING IN COMBINATION: AN AIRCRAFT; A TRANSPONDER ON SAID AIRCRAFT FOR TRANSMITTING AN INTERROGATION SIGNAL TO A LEADING AIRCRAFT AND A DISTANCE REPLY SIGNAL TO A TRAILING AIRCRAFT UPON INTERROGATION THEREBY; FIRST AND SECOND RECEIVER UNITS SPACED APART ON SAID AIRCRAFT AND OPERATIVE TO RECEIVE A DISTANCE REPLY SIGNAL FROM A LEADING AIRCRAFT INTERROGATED TRANSPONDER; AND A COMPARATOR CONNECTED TO SAID RECEIVER UNITS OPERATIVE TO MEASURE AND COMPARE THE TIME RELATIONSHIP OF ANY DISTANCE REPLY SIGNAL RECEIVED BY SAID RECEIVER UNITS FROM A LEADING AIRCRAFT INTERROGATED TRANSPONDER.
Claim 2
Dependent Claim
103 words
AN AIRCRAFT NAVIGATION SYSTEM FOR INDICATING A RELATIVE STATION RELATIONSHIP BETWEEN TWO AIRCRAFT IN FLIGHT FORMATION COMPRISING IN COMBINATION: AN AIRCRAFT; A TRANSPONDER ON SAID AIRCRAFT FOR TRANSMITTING AN INTERROGATION SIGNAL TO A LEADING AIRCRAFT AND A DISTANCE REPLY SIGNAL TO A TRAILING AIRCRAFT UPON INTERROGATION THEREBY; FIRST AND SECOND RECEIVER UNITS SPACED APART ON SAID AIRCRAFT AND OPERATIVE TO RECEIVE A DISTANCE REPLY SIGNAL FROM A LEADING AIRCRAFT INTERROGATED TRANSPONDER; AND A COMPARATOR CONNECTED TO SAID RECEIVER UNITS OPERATIVE TO MEASURE AND COMPARE THE TIME RELATIONSHIP OF ANY DISTANCE REPLY SIGNAL RECEIVED BY SAID RECEIVER UNITS FROM A LEADING AIRCRAFT INTERROGATED TRANSPONDER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |