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:
Jan. 29, 1991
Filed:
Sep. 29, 1989
Applicant:
Inventor:
Geoffrey K Crawshaw, Wellesley, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E02D / ;
U.S. Cl.
CPC ...
405229 ; 521691 ; 521695 ; 98 331 ; 405303 ;
Abstract
A system for extracting radon and other gases from a subterranean cavity beneath a floor slab and venting of collected gases to the atmosphere is provided which conducts cool, naturally occuring radon and other gases under high vacuum across a vacuum pump motor for cooling the motor. A vacuum pump is disposed within a housing chamber under vacuum. Cool gases within the housing chamber thereby conduct heat generated by the pump motor to the atmosphere.