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:
Apr. 28, 1992
Filed:
Aug. 30, 1990
Applicant:
Inventor:
Michael T Romanyszyn, Jr, Springfield, OH (US);
Assignee:
Robbins & Myers, Inc., Dayton, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04C / ; F04C / ; G05D / ;
U.S. Cl.
CPC ...
418 15 ; 418 48 ; 418153 ; 137 99 ;
Abstract
A pump assembly includes commonly driven coaxially positioned helical rotors, rotatably engageable within corresponding stators. Each combination of rotor and stator defines a pump having a different volumetric flow rate, each pump discharging to a common discharge port, thereby providing an accurately proportioned mixed fluid of two separate fluids. The rotors are integrally molded from a thermoplastic material and include an integral drive shaft suitable for interconnection to an electric motor. The two rotors are simultaneously driven by a common drive shaft and therefore produce a constant mixed ratio irrespective of rotational speed.