Self extinguishing cigarette
Patent 3985143 Issued on October 12, 1976. Estimated Expiration Date: 
October 12, 1993. 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.
October 12, 1993. 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 1726737 3884246 InventorApplicationNo. 551537 filed on 02/21/1975US Classes:131/349With ash retainer or means to prevent or retard burningExaminersPrimary: Michell, Robert W.Assistant: Millin, V. Attorney, Agent or FirmAbstractMeans for automatically extinguishing a cigarette when it has burned to a pre-determined position along its length. The means comprises a small sack of liquid, ordinarily water, positioned at the required location within the tobacco and the paper tube. The sack will be ruptured by the advancing heat of the burning tobacco and the released water will be in sufficient quantity to quench the flame. | |
