Cigarettes
Patent 4044778 Issued on August 30, 1977. Estimated Expiration Date: 
August 30, 1994. 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.
August 30, 1994. 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 1946203 1996002 2272206 2580609 2985175 3006347 3030963 3313305 InventorApplicationNo. 05/395650 filed on 09/10/1973US Classes:131/349With ash retainer or means to prevent or retard burningExaminersPrimary: Michell, Robert W.Assistant: Millin, V. Attorney, Agent or FirmAbstractA self-extinguishing cigarette particularly when in contact with a flammable surface wherein the wrapper which encloses the body of tobacco is provided with a coating deposited from an aqueous solution of an alkali silicate. The silicate solution contains from about 17 to 27 percent by weight of SiO2. The coating area of the silicate solution on the wrapper is from about 40 to 84 percent of the entire outside wrapper area. The silicate solution may have added thereto various beneficial additives such as acids, carbohydrates, colloids, humectants, fire retardent compounds, alumina gel compounds, or compatible compounds of the aforesaid additives.Other References
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