Sprinkler system for existing buildings
Patent 4047570 Issued on September 13, 1977. Estimated Expiration Date: 
September 13, 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.
September 13, 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 2265810 2558175 2718383 2848935 3177795 3584689 InventorApplicationNo. 05/664587 filed on 03/08/1976US Classes:169/16, Distributing systems454/300ConcentricExaminersPrimary: Blunk, Evon C.Assistant: Mar, Michael Attorney, Agent or FirmInternational ClassA62C 35/00 (20060101)AbstractA sprinkler system is furnished for an existing building by placing in the air ducts above the hung ceilings main branch tubes made of plastic. The main branch tubes mounted in the air ducts are in fluid communication with sprinkler heads by connecting secondary branch tubes. Additional branch tubes are provided which connect the main branch tubes with the supply of water and which also allow for the avoidance of obstructions within any duct by rerouting the main branch tubes outside of the ducts until the obstruction is cleared. The invention receives the supply of water from an existing standpipe of a building, and is supplied with control means for regulating the flow of water. | |
