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. 14, 1993
Filed:
Aug. 05, 1992
Leigh A Smith, Pfafftown, NC (US);
R. J. Reynolds Tobacco Company, Winston-Salem, NC (US);
Abstract
Tobacco material is extracted with an extraction solvent to provide a aqueous extract and a tobacco portion insoluble in the solvent. The extract is separated from the insoluble portion and is provided within the water at a concentration at least about 30 percent, based on the weight of the extract and solvent. The extract and solvent are subjected to temperature treatment including reducing the temperature of the extract and solvent from a first temperature to a second temperature. Potassium nitrate crystals form as a precipitate and are separated from the extract and solvent. Then, the extract and solvent are contacted with activated carbon particles and separated therefrom.