US3304539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Freeway access ramp traffic control
Assignee: SPX Technologies Inc
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Filing: 1965-10-15
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Granted: 1967-02-14
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Expires: 1985-10-15
Abstract
No abstract record available.
Inventors
- 👤 Jr John H Auer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:50
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/07; G08G1/075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN AN ACCESS CONTROL SYSTEM FOR A FREEWAY HAVING AN ENTRANCE RAMP AND A TRAFFIC SIGNAL CONTROLLING VEHICULAR ENTRY FROM THE RAMP ONTO THE FREEWAY, A FIRST VEHICLE PRESENCE DETECTOR SITUATED TO SENSE FREEWAY LANE OCCUPANCY, A SECOND VEHICLE PRESENCE DETECTOR SITUATED TO SENSE RAMP OUTLET OCCUPANCY, A THIRD VEHICLE PRESENCE DETECTOR SITUATED TO SENSE RAMP INLET OCCUPANCY, AND MEANS CONNECTING THE DETECTORS TO THE TRAFFIC SIGNAL FOR CONTROLLING DURATION OF RED SIGNAL AND GREEN SIGNAL IN ACCORDANCE WITH TRAFFIC CONDITIONS SENSED BY THE VEHICLE PRESENCE DETECTORS.
Claim 2
Dependent Claim
87 words
IN AN ACCESS CONTROL SYSTEM FOR A FREEWAY HAVING AN ENTRANCE RAMP AND A TRAFFIC SIGNAL CONTROLLING VEHICULAR ENTRY FROM THE RAMP ONTO THE FREEWAY, A FIRST VEHICLE PRESENCE DETECTOR SITUATED TO SENSE FREEWAY LANE OCCUPANCY, A SECOND VEHICLE PRESENCE DETECTOR SITUATED TO SENSE RAMP OUTLET OCCUPANCY, A THIRD VEHICLE PRESENCE DETECTOR SITUATED TO SENSE RAMP INLET OCCUPANCY, AND MEANS CONNECTING THE DETECTORS TO THE TRAFFIC SIGNAL FOR CONTROLLING DURATION OF RED SIGNAL AND GREEN SIGNAL IN ACCORDANCE WITH TRAFFIC CONDITIONS SENSED BY THE VEHICLE PRESENCE DETECTORS.
References Cited (Backward Citations)
US3237154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |