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. 01, 1993
Filed:
Apr. 05, 1991
Applicant:
Inventors:
Robert L Andrews, Plymouth, MA (US);
Edward A Packard, Plymouth, MA (US);
Assignee:
Hyer Industries, Inc., Pembroke, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A45D / ;
U.S. Cl.
CPC ...
222203 ; 222234 ; 406134 ;
Abstract
A volumetric dry material feeder comprising a movable wall hopper. Nesting lower and end wall hopper components receive and clamp a flexible diaphragm sheet in position to overlie mutually opposing hopper walls and to receive and isolate the material therefrom. A pair of thrust plates are each located between the diaphragm and a hopper wall and alternately displaced relative thereto at differing frequencies to produce a continually varying combination of thrust plate movements.