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:
Jun. 17, 1986
Filed:
May. 21, 1984
Applicant:
Inventors:
Brian R Watts, Cerritos, CA (US);
Robert E Carlton, Seal Beach, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A47K / ; E03C / ;
U.S. Cl.
CPC ...
4287 ; 4288 ; 4292 ; 4295 ; 137844 ;
Abstract
A floor drain for hazardous environments comprises a grating, a housing, and an elastic one-way valve clamped by a flange between the grating and the housing. The valve has a tubular body with contacting parallel wall portions which open when a liquid enters the valve. The valve closes when there is no pressure at the inlet. The valve closes more tightly in the event of elevated down stream pressure, positively preventing the escape of gas. An existing, unprotected drain can be retrofitted with the one-way valve.