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. 09, 1992
Filed:
Jul. 24, 1990
Andrew B Lehnert, Copley, OH (US);
Henri J Gruenbauer, HC Oostburg, NL;
The Dow Chemical Company, Midland, MI (US);
Abstract
Apparatus (10) for incorporating blowing agents into a liquid material provides a high pressure liquid storage and mixing tank (20) containing a mixture of liquid material (M) under pressure; means for delivering (59) a pre-determined quantity of at least one blowing agent into the mixture in minute bubbles having an average diameter of from about less than 0.5 micron up to about 100 microns; and means for uniformly distributing (60) the blowing agent throughout the liquid material. Apparatus (100) for measuring the volumetric expansion potential of a mixture of blowing agent and liquid material is also provided. It includes a high pressure liquid storage and mixing tank (106) containing a mixture of liquid material (M) and at least one blowing agent under pressure; first and second chambers (140, 141) communicating with each other and with the tank; first and second means for transferring (142, 143) the mixture into and out of the first and second chambers; and first and second means for measuring (144, 145) the volumes displaced by the mixture in the first and second chambers, wherein the second measuring chamber has a volume at least one order of magnitude greater than the first chamber. Finally methods are provided for use of the foregoing apparatuses.