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:
Sep. 05, 2006
Filed:
Dec. 19, 2002
Timothy J. Adaway, Midland, MI (US);
Michael A. Gonzalez, Sanford, MI (US);
Weishi Wu, Midland, MI (US);
Timothy J. Adaway, Midland, MI (US);
Michael A. Gonzalez, Sanford, MI (US);
Weishi Wu, Midland, MI (US);
Dow Global Technologies Inc., Midland, MI (US);
Abstract
A method for preparing a composition of the formulain a yield greater than 50% where Ris C 1-20 comprising the steps of combining fluorene or dibromo flourene, an excess of alkali metal hydroxide and a halogenated alkyl in the presence of a phase transfer catalyst but in the absence of a polar aprotic solvent; heating the combination; and separating the dialkylated fluorene or dialylated dibromo fluorene. If the flourene is not brominated prior to alkylation, the dialkylated fluorene is then brominated.