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:
Sep. 15, 1998
Filed:
Dec. 13, 1996
Applicant:
Inventor:
Trevor George Sanders, Berks, GB;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E02F / ;
U.S. Cl.
CPC ...
172-45 ; 37DI / ;
Abstract
The invention relates to apparatus for monitoring the depth of a layer of a filter media such as sand in a filter such as a slow sand filter, comprising a leveller, in the embodiment a box leveller with a trailing smoothing device, wheel or roller, adapted to level the surface of the layer of sand and a laser device mounted on a mount which is movable substantially vertically and has a calibration means in the form of a visual calibration scale whereby to determine depth of filter media.