Concentrates for fire-fighting foam
Patent 4387032 Issued on June 7, 1983. Estimated Expiration Date: 
December 8, 2000. 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.
December 8, 2000. 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 2088085 3915800 Fire fighting with thixotropic foam Fighting fire Patent #: 4149599 InventorAssigneeApplicationNo. 06/214260 filed on 12/08/1980US Classes:252/3, Foam or gas phase containing169/44, With mixing of extinguishing compounds169/46, Of extinguishing fire169/47, By projecting extinguishant directly onto seat of fire252/363.5, SOLIDS WITH SOLUTION OR DISPERSION AIDS252/8.05, Foam-stabilizant or colloid-stabilizant containing516/105, The compound is a carbohydrate* or carbohydrate-derivative* (e.g., mono- or polysaccharide)516/12, The agent contains organic compound containing halogen516/14, The agent contains organic compound containing sulfoxy*516/18The agent contains organic compound containing oxygenExaminersPrimary: Kight, III, JohnAssistant: Nutter, Nathan M. Attorney, Agent or FirmInternational ClassesA62D 1/00 (20060101)A62D 1/02 (20060101) A62C 39/00 (20060101) AbstractFire-fighting foam effective against burning hydrophilic or polar liquids like lower alcohols, ketones, etc. is made from concentrate containing thixotropic thickener dissolved in large amount, up to 1.5% or more, yet has a tolerable viscosity so that it can be poured or pumped. Heteropolysaccharide-7 or chain-shortened modifications of it are particularly suitable for this purpose. Higher concentrations are made practical by including in the concentrate urea, thiourea, ammonium cyanate or ammonium thiocyanate, to reduce the concentrate's viscosity and keep the polysaccharide from separating out upon freezing. Magnesium salts can also be dissolved in concentrate to improve fire extinguishing action when diluted with fresh water. | |
