Cigarettes
Patent 4146040 Issued on March 27, 1979. Estimated Expiration Date: 
March 17, 1997. 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 17, 1997. 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 References 1798537 1996002 2718889 2766148 3030963 3368566 3581748 3861403 3878850 Removal of harmful components from tobacco smoke Patent #: 4006749 InventorApplicationNo. 05/778665 filed on 03/17/1977US Classes:131/349With ash retainer or means to prevent or retard burningExaminersPrimary: Michell, Robert W.Assistant: Millin, V. Attorney, Agent or FirmInternational ClassesA24D 1/02 (20060101)A24D 1/00 (20060101) AbstractA fire resistant cigarette has a wrapper having a coating applied as a dual treatment comprising the separate steps of coating the wrapper with a solution of an alkali metal silicate and coating the wrapper with a pH lowering material wherein the pH lowering material lowers the pH of the alkali silicate. The dual treatment of the cigarette is such that when the cigarette is smoked it produces a smoke which has a pleasing taste and the cigarette is fire resistant.Other References
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