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:
Feb. 10, 1981
Filed:
Aug. 23, 1979
Applicant:
Inventors:
Andrew C Harvey, Waltham, MA (US);
Mackenzie Burnett, Wayland, MA (US);
Assignee:
Foster-Miller Associates, Inc., Waltham, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B65G / ;
U.S. Cl.
CPC ...
406 51 ; 198625 ; 198629 ; 198795 ; 406 56 ; 406 79 ;
Abstract
An injector with a pair of counter-rotating screws that are mounted along parallel axes in cylindrical chambers formed in a housing are driven in synchronism by a driver. A series of plates are slidably received in a track provided in the housing and are fitted between successive flights of the screws. The plates are carried by the screws in an endless path within the housing. Pockets formed by the plates, screw flights and chamber walls carry particulate solids from an inlet port to a discharge port of the housing for injection into a pressurized hydraulic transport line.