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:
Nov. 21, 1989
Filed:
Sep. 30, 1987
Applicant:
Inventor:
David S Dick, San Luis Obispo, CA (US);
Assignee:
Jenike & Johanson, Inc., No. Billerica, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B65G / ;
U.S. Cl.
CPC ...
414218 ; 406 60 ; 100145 ; 241246 ; 414213 ; 414326 ; 222413 ; 222189 ; 222195 ; 198669 ; 198670 ; 198671 ;
Abstract
A screw seal for conveying bulk particulate solids between spaces at differing gas pressures with minimal leakage of gas. A tubular housing encloses a screw conveyor section and a sealing section receiving the solids and forming a sealing plug. The sealing section has a divergent configuration that functions in combination with friction to create sufficient solids pressure with minimal driving torque and wear on the screw conveyor.