US3786507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle anti-collision system
Assignee: Individual
•
Filing: 1971-11-11
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Granted: 1974-01-15
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Expires: 1991-11-11
Abstract
Abstract A doppler radar is mounted to face rearwardly of a roadway vehicle and to respond only to reflected radar signals from objects, e.g., following vehicles, which approach at a predetermined closing velocity, and an indicator for signalling both to the following driver by means of lights on the radar equipped vehicle and to the driver of the radar equipped vehicle itself.
Inventors
- 👤 C Hurd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/93; G01S13/931; B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/50; B60Q1/525; B60Q1/535; G01S2013/9327; G01S2013/93272
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A method for signalling the occurrence of dangerous conditions in the operation of a roadway vehicle, said method comprising the steps of continuously emitting electromagnetic energy rearwardly of the direction in which the vehicle travels, monitoring rearwardly of the vehicle for the reflection, from following vehicles, of the emitted electromagnetic energy, selectively detecting in the monitored electromagnetic energy only the presence of doppler effects caused by the closing speed between said roadway vehicle and one of said following vehicles exceeding a predetermined amount, and generating a warning indication in response to such detection.
Claim 2
Independent Claim
93 words
A method for signalling the occurrence of dangerous conditions in the operation of a roadway vehicle, said method comprising the steps of continuously emitting electromagnetic energy rearwardly of the direction in which the vehicle travels, monitoring rearwardly of the vehicle for the reflection, from following vehicles, of the emitted electromagnetic energy, selectively detecting in the monitored electromagnetic energy only the presence of doppler effects caused by the closing speed between said roadway vehicle and one of said following vehicles exceeding a predetermined amount, and generating a warning indication in response to such detection.
Claim 3
Dependent Claim
34 words
A method according to claim 1, wherein said detecting includes the step of responding only to reflected electromagnetic energy having a frequency which is higher, by a predetermined amount, than the emitted electromagnetic energy.
Claim 4
Dependent Claim
30 words
A method according to claim 1, wherein the step of generating a warning indication includes the step of producing a signal which is visible externally of the vehicle rearwardly thereof.
Claim 5
Dependent Claim
30 words
A method according to claim 1, wherein the step of generating a warning indication includes the step of producing an alarm indication capable of alerting the driver of the vehicle.
Claim 6
Dependent Claim
109 words
In combination, a roadway vehicle, a doppler radar mounted on said raodway vehicle to face rearwardly thereof, said radar being operative to produce output signals in response to the occurrence of reflected radar waves having doppler components corresponding to a predetermined closing velocity between said roadway vehicle and a following vehicle, warning indicator means operative in response to said output signals to signal the occurrence of said closing velocity and doppler magnitude indicator means connected between said doppler radar and said warning indicator means, said doppler mAgnitude indicator means being operative to prevent output signals except where said signals represent a closing velocity greater than said predetermined closing velocity.
Claim 7
Dependent Claim
109 words
In combination, a roadway vehicle, a doppler radar mounted on said raodway vehicle to face rearwardly thereof, said radar being operative to produce output signals in response to the occurrence of reflected radar waves having doppler components corresponding to a predetermined closing velocity between said roadway vehicle and a following vehicle, warning indicator means operative in response to said output signals to signal the occurrence of said closing velocity and doppler magnitude indicator means connected between said doppler radar and said warning indicator means, said doppler mAgnitude indicator means being operative to prevent output signals except where said signals represent a closing velocity greater than said predetermined closing velocity.
Claim 8
Dependent Claim
36 words
A combination according to claim 5, wherein said doppler radar is operative to produce outputs only in response to the occurrence of reflected radar waves whose frequency is higher than the frequency transmitted by said radar.
Claim 9
Dependent Claim
26 words
A combination according to claim 5, wherein said warning indicator means comprises an illuminated sign mounted on the rear of said vehicle to shine rearwardly thereof.
Claim 10
Dependent Claim
27 words
A combination according to claim 7, wherein said illuminated sign is provided with a flasher to turn same on and off in rapid sequence upon activation thereof.
Claim 11
Dependent Claim
22 words
A combination according to claim 5, wherein said warning indicator means includes alarm means mounted inside said vehicle for alerting its driver.
Claim 12
Dependent Claim
15 words
A combination according to claim 9, wherein said alarm means includes an audible signal generator.
Claim 13
Dependent Claim
13 words
A combination according to claim 9, wherein said alarm means includes a light.
References Cited (Backward Citations)
US2974304A
Cited
US3442347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |