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. 14, 1989
Filed:
Apr. 25, 1988
Louis C Rubens, Midland, MI (US);
Stephen P Chum, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
Closed-cell foam particles are pressurized to produce particles useful in a process using secondary foaming to achieve a lower density foam. Closed-cell foam particles are initially compressed in a first stage compression tank and then transferred to a main gas pressurization tank. The main gas pressurization tank comprises multi-level shelves, each with a set of compartments. Charges of foam particles pass sequentially through the shelves while becoming fully pressurized. The multi-level shelves with means to move charges of foam particles from shelf to shelf are responsible for the closed cell foam particles becoming pressurized in an efficient manner.