Patent US4684949A successfully refreshed from Google Patents.
US4684949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
VHF/radar transponder collision avoidance aid
Assignee: United States Department of Transportation
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Filing: 1983-01-17
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Granted: 1987-08-04
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Expires: 2003-01-17
Abstract
Abstract A radiotelephone and a radar transponder are interconnected in such a manner as to establish a VHF communications link via the radiotelephone in response to interrogation of the radar transponder. The radar transponder will ordinarily be periodically enabled and will transmit a code which partially identifies the transmission source in response to interrogation when enabled. The radiotelephone will also be periodically enabled so as to transmit a more complete identifying code and requests and coded information received via the VHF communications link will be decoded and displayed.
Inventors
- 👤 Rudolph M. Kalafus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:52
CPC Classifications
G; G08; G08G; G08G3/00; G08G3/02; G01; G01S; G01S13/00; G01S13/88; G01S13/93
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
A communications system comprising: radar transponder means; radio transceiver means comprising a VHF radiotelephone; and means operatively coupling said transponder and transceiver means, said coupling means comprising: clock means, said clock means generating timing signals; means responsive to said clock means generated timing signals for periodically enabling said transponder means and said transceiver means; modulator means, said modulator means delivering a coded identification signal to said transceiver means for transmission upon the enabling thereof; decoder means, said decoder means demodulating coded information bearing signals received by said transceiver means; display means connected to said decoder means for displaying identification information received by said transceiver means; and encoder means, said encoder means being manually operable to generate desired request signals, said encoder means being connected to said modulator means whereby coded requests can be transmitted to a transceiver whose identification is displayed by said display means.
Claim 2
Dependent Claim
145 words
A communications system comprising: radar transponder means; radio transceiver means comprising a VHF radiotelephone; and means operatively coupling said transponder and transceiver means, said coupling means comprising: clock means, said clock means generating timing signals; means responsive to said clock means generated timing signals for periodically enabling said transponder means and said transceiver means; modulator means, said modulator means delivering a coded identification signal to said transceiver means for transmission upon the enabling thereof; decoder means, said decoder means demodulating coded information bearing signals received by said transceiver means; display means connected to said decoder means for displaying identification information received by said transceiver means; and encoder means, said encoder means being manually operable to generate desired request signals, said encoder means being connected to said modulator means whereby coded requests can be transmitted to a transceiver whose identification is displayed by said display means.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 wherein said transceiver means comprises: a radiotelephone including a receiver and transmitter.
Claim 4
Dependent Claim
38 words
The apparatus of claim 2 wherein said transponder means includes an internal clock whereby said transponder means, when enabled by said enabling means, will transmit a signal having preselected characteristics when interrogated by a similar remotely located transponder.
Claim 5
Dependent Claim
36 words
The apparatus of claim 3 including encoder means responsive to the reception from a remote transceiver of the identification signal provided by said modulator means and a transponder enable request signal for enabling said transponder means.
Claim 6
Dependent Claim
57 words
The apparatus of claim 4 further comprising: annunciator means, said annunciator means being energized by an output provided by said decoder means in response to said decoder means receiving an identification signal commensurate with that provided by said modulator means and an annunciator activation request signal provided by the encoder means of a remotely located coupling means.
Claim 7
Dependent Claim
48 words
The apparatus of claim 3 wherein said encoder means includes: data entry means for providing signals commensurate with a selected receiver identification signal and requests; and means responsive to the signals provided by said data entry means for generating binary coded signals for application to said modulator means.
Claim 8
Dependent Claim
36 words
The apparatus of claim 6 including encoder means responsive to the reception from a remote transceiver of the identification signal provided by said modulator means and a transponder enable request signal for enabling said transponder means.
Claim 9
Dependent Claim
57 words
The apparatus of claim 7 further comprising: annunciator means, said annunciator means being energized by an output provided by said decoder means in response to said decoder means receiving an identification signal commensurate with that provided by said modulator means and an annunciator activation request signal provided by the encoder means of a remotely located coupling means.
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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |