Patent US4077005A successfully refreshed from Google Patents.
US4077005A
Expired / Lapsed
US
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Secure position identity and time reporting system
Assignee: United States Department of the Navy
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Filing: 1971-06-18
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Granted: 1978-02-28
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Expires: 1991-06-18
Abstract
Abstract A system for identifying ships and aircraft, both in position and time, uizing shipboard cryptographic equipment and satellites is described.
Inventors
- 👤 Walton B. Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:15
CPC Classifications
H; H04; H04K; H04K1/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A cryptosecure identification system comprising: a ship; means aboard said ship for transmitting an enciphered identification code, position, and time of day signal; an airborne relay station; receiver means aboard said relay station; clock means aboard said relay station for supplying the time of day of said received enciphered signal; means aboard said relay station for retransmitting said enciphered signal and said satellite time of day signal; ground receiving means including means for deciphering said retransmitted enciphered signal and comparing the two time of day signals; and means for indicating said signal to be valid if the difference between said two time of day signals is less than a predetermined time.
Claim 2
Dependent Claim
111 words
A cryptosecure identification system comprising: a ship; means aboard said ship for transmitting an enciphered identification code, position, and time of day signal; an airborne relay station; receiver means aboard said relay station; clock means aboard said relay station for supplying the time of day of said received enciphered signal; means aboard said relay station for retransmitting said enciphered signal and said satellite time of day signal; ground receiving means including means for deciphering said retransmitted enciphered signal and comparing the two time of day signals; and means for indicating said signal to be valid if the difference between said two time of day signals is less than a predetermined time.
Claim 3
Dependent Claim
16 words
An identification system as recited in claim 1 wherein said relay station is a geostationary satellite.
Claim 4
Dependent Claim
45 words
An identification system as recited in claim 1 wherein said relay station is a variable positioned satellite, and further including delay means aboard said satellite for storing said enciphered signal and the satellite time of day until said satellite retransmits to said ground receiving means.
Claim 5
Dependent Claim
19 words
An identification system as recited in claim 3 further including: means for displaying and correlating said valid deciphered signal.
Claim 6
Dependent Claim
24 words
An identification system as recited in claim 4 wherein said ship is an airship and said time of day signals are produced by clocks.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |