Process for the manufacture of synthetic smoking materials
Patent 4079742 Issued on March 21, 1978. Estimated Expiration Date: 
March 21, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 21, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsApplicationNo. 05/734033 filed on 10/20/1976US Classes:131/359Tobacco substitute, i.e., nontobaccoExaminersPrimary: Michell, Robert W.Assistant: Millin, V. AbstractAn improved process is provided for the manufacture of synthetic smoking materials. The process comprises the steps of:(1) Pyrolyzing a cellulosic material at a temperature of from about 150° C to about 400° C, and preferably from about 175° C to about 275° C, under conditions such that from about 8 to about 40% and preferably from about 10 to 25% by weight of the cellulosic material is removed, and(2) Thereafter subjecting the resulting pyrolyzed cellulosic material to extraction with a basic liquid, for example, liquid ammonia, amine or aqueous bases, preferably under conditions to swell the material, whereby from about 15 to about 40%, and preferably from about 20 to about 30%, of the weight of the pyrolyzed product is removed during the extraction.Both steps should preferably be conducted in such a manner that the overall weight loss of the original cellulosic material is in the range of from about 25 to about 65%, preferably from about 30 to about 50%, whereby the resultant product has a tobacco-like brown color, is not brittle, and has improved smoking characteristics. | |
