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:
Jan. 29, 1991
Filed:
Mar. 05, 1990
Donald Firth, Devon, GB;
Stamet, Inc., Santa Monica, CA (US);
Abstract
A multiple-choke unit for transporting and metering particulate material wherein the material is compacted to bridging, disturbed and then recompacted as it is friction driven through a duct. The duct has two opposed walls moving between the inlet and outlet which have a surface area that is larger than the surface area of a stationary wall or walls which from the other part of the duct. The duct includes a plurality of chokes which bridge by compaction, disturb and recompact the material as it is friction-driven through the unit. The unit provides simultaneous transport and metering of particulate material. The unit may be used to transport particulate material under atmospheric conditions or into a pressurized system.