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. 11, 1996
Filed:
Aug. 24, 1994
Applicant:
Inventor:
Frank S Hyer, Duxbury, MA (US);
Assignee:
Hyer Industries, Inc., Pembroke, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01F / ;
U.S. Cl.
CPC ...
222241 ; 222413 ; 198662 ; 198669 ;
Abstract
A compound screw feeder for uniform volumetric flow rates of particulate solids, suitable for low, nonpulsating feed rates, comprises coaxial inner and outer screw flights. The flights both extend throughout the feeder section and produce a net discharge flow rate dependent on their respective feed directions and rates of feed. Various forms of the feeder may be employed in a loss of weight screw feeder system.