Flame and smoke shutoff system
Patent 4077474 Issued on March 7, 1978. Estimated Expiration Date: 
March 7, 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 7, 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 ReferencesInventorApplicationNo. 05/656693 filed on 02/09/1976US Classes:169/48, APPARATUS WHICH ISOLATES FLAMES FROM NON-BURNING AREA160/1, AUTOMATIC CONTROL169/15, Stream impregnating169/61Electrical controlExaminersPrimary: Love, John J.Assistant: Mar, Michael Attorney, Agent or FirmForeign Application Priority Data1975-02-14 JAAbstractA fire curtain constituted by two nets of nonflammable material is stored in a container on the ceiling and hangs therefrom as soon as a fire starts. Simultaneously, a mixture of water and a bubbling agent in the form of fine bubbles is flown down the curtain to check the spread of flame and smoke. Any section where a fire starts can be isolated from neighboring sections by means of a plurality of such fire curtains. Made of soft, flexible material, the curtain used neither injures a person upon closure nor prevents him from escaping to safer places. | |
