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. 22, 1993
Filed:
Aug. 27, 1991
Applicant:
Inventor:
Donald L Zink, Billings, MT (US);
Assignee:
Montana Sulphur & Chemical Co., Billings, MT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A01M / ; F16K / ;
U.S. Cl.
CPC ...
137565 ; 137347 ; 137587 ; 2513353 ; 417375 ; 417401 ;
Abstract
An internal pump assembly including a fluid tank defining a fluid compartment, and first and second vessels positioned in the tank. The second vessel has a second vessel port through which fluid can flow relative to the fluid compartment. A bellows pump assembly positioned at least partially in the first vessel pumps fluid from the fluid compartment through the second vessel port into the second vessel from which the fluid can be subsequently removed. The fluid in the compartment acts on the bellows surface to thereby bias the pump assembly towards one of a pumping or a non-pumping position.