Patent US3353404A successfully refreshed from Google Patents.
US3353404A
Expired / Lapsed
US
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Apparatus for testing road surfaces and method
Assignee: Dresser Industries Inc
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Filing: 1965-01-29
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Granted: 1967-11-21
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Expires: 1985-01-29
Abstract
No abstract record available.
Inventors
- 👤 Swift Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:28
CPC Classifications
G; G01; G01C; G01C7/00; G01C7/02; G01C7/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
AN APPARATUS FOR MEASURING THE ROUGHNESS OF A ROAD SURFACE, COMPRISING: A MEMBER ADAPTED FOR PASSING ALONG THE ROAD AND HAVING MEANS FOR SUBSTANTIALLY CONTINUOUSLY CONTACTING THE ROAD SURFACE AT A MOVABLE CONTACT POINT DURING HORIZONTAL MOVEMENT THEREALONG; MEANS FOR SENSING THE VERTICAL MOVEMENT OF THE CONTACT POINT DURING HORIZONTAL MOVEMENT ALONG THE ROAD AND PRODUCING A FRIST ELECTRICAL SIGNAL REPRESENTATIVE OF THE VERTICAL VELOCITY THEREOF; MEANS FOR RECTIFYING THE FRIST ELECTRICAL SIGNAL TO PRODUCE A SUBSTANTIALLY UNIDIRECTIONAL SECOND ELECTICAL SIGNAL PROPORTIONAL TO THE FIRST ELECTRICAL SIGNAL, AND MEANS FOR INTEGRATING THE SECOND SIGNAL OVER A PREDETERMINED INTERVAL AS AN INDICATION OF ROAD ROUGHNESS.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |