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US5235329A
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Emergency vehicle detection device
Assignee: E A S Emergency Alert Systems Inc
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Filing: 1991-10-01
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Granted: 1993-08-10
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Expires: 2011-10-01
Abstract
Abstract A combination to detect the proximity of an emergency vehicle including a transmitter in the emergency vehicle and a receiver in another vehicle, the receiver actuating an alarm such as a blinking light upon the reception of a transmission from an emergency vehicle.
Inventors
- 👤 LeGrant Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:26
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/09; G08G1/0962; G08G1/0965
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
A device to detect the proximity of a first vehicle to a second vehicle comprising a transmitter of a wave-carried signal in said first vehicle, said signal being in two broad frequency bands separated by a dead zone between said bands, a receiver for said wave-carried signal in said second vehicle, alarm means in said second vehicle, means associated with said receiver to actuate said alarm means when a wave-carried signal is received in said second vehicle, a receiver in said first vehicle for receiving a signal having a frequency in said dead zone transmitted by the second vehicle.
Claim 2
Independent Claim
99 words
A device to detect the proximity of a first vehicle to a second vehicle comprising a transmitter of a wave-carried signal in said first vehicle, said signal being in two broad frequency bands separated by a dead zone between said bands, a receiver for said wave-carried signal in said second vehicle, alarm means in said second vehicle, means associated with said receiver to actuate said alarm means when a wave-carried signal is received in said second vehicle, a receiver in said first vehicle for receiving a signal having a frequency in said dead zone transmitted by the second vehicle.
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein said wave-carried signal is a radio signal.
Claim 4
Dependent Claim
16 words
The device of claim 2 wherein said radio signal is carried in a citizen's band frequency.
Claim 5
Dependent Claim
15 words
The device of claim 1 wherein said wave-carried signal carries less than approximately 500 meters.
Claim 6
Dependent Claim
10 words
The device of claim 1 wherein said alarm is visible.
Claim 7
Dependent Claim
12 words
The device of claim 5 wherein said alarm comprises a flashing light.
Claim 8
Dependent Claim
17 words
The device of claim 6 wherein said flashing light is a dome light located in said vehicle.
Claim 9
Dependent Claim
12 words
The device of claim 1 wherein said alarm comprises an audible sound.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |