The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1998
Filed:
Sep. 11, 1995
Applicant:
Inventor:
Roger F Johnson, Bellevue, WA (US);
Assignee:
Quest Integrated, Inc., Kent, WA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E01C / ;
U.S. Cl.
CPC ...
73146 ; 73800 ;
Abstract
A rolling weight deflectometer for monitoring deflection of pavement under load. The deflectometer incorporates an alignment laser beam emitter that measures vertical displacement of each of a plurality of distance sensors mounted on a horizontal sensor bearer member that bends or vibrates as it is transported over a pavement for deflection measurement. The measured vertical displacements, due to member bending, allow the deflectometer to compensate for errors introduced by member bending and thereby provide a more accurate measurement of pavement deflection.