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:
Mar. 02, 1982
Filed:
Dec. 31, 1979
Applicant:
Inventor:
Joseph M Magrath, McCook, NE (US);
Assignee:
Merck & Co., Inc., Rahway, NJ (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B67D / ;
U.S. Cl.
CPC ...
222309 ; 222 66 ; 222186 ; 222341 ;
Abstract
Disclosed is an improved piston operated pump for viscous materials wherein the entrapment of air bubbles in the viscous material is reduced by placing a spring in the pump cylinder. The spring is the same diameter as the pump cylinder and is about as long as the length of travel of the piston. The spring is conical in shape so that it may be fully compressed without substantially affecting the capacity of the pump cylinder or the length of the piston stroke.