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:
Jul. 26, 1994
Filed:
Jan. 27, 1993
Applicant:
Inventor:
Harold W Bentley, Tucson, AZ (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B09B / ;
U.S. Cl.
CPC ...
405128 ; 405258 ;
Abstract
Volatile contaminants are removed from the vadose zone of contaminated earth by vacuum extraction through a borehole placed into the contaminated area. Means are provided for substantially trapping water within the extraction borehole so as to prevent contaminated water from being brought to the surface. Means are also provided for maintaining substantially atmospheric pressure at the bottom of the extraction borehole so as to prevent water from the water table from rising into the borehole and to allow improved circulation of air through the contaminated zone.