Apparatus for dental treatment provided with check valve in fluid passage
Patent 4797098 Issued on January 10, 1989. Estimated Expiration Date: 
April 22, 2007. 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.
April 22, 2007. 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 2982446 Valve with draw back after closing Patent #: 4062480 InventorAssigneeApplicationNo. 07/041090 filed on 04/22/1987US Classes:433/98, Including activator or regulator for controller or drive137/614.2, Direct response normally closed valve limits direction of flow141/116, By means reversing direction of flow222/571, Antidrip433/101Foot operatedExaminersPrimary: Jones, LarryAssistant: Kamen, Noah P. Attorney, Agent or FirmInternational ClassesA61C 1/00 (20060101)A61C 1/05 (20060101) AbstractA dental treatment apparatus includes a pressurized fluid source for pressurizing and supplying a fluid necessary for performing dental treatment operation and fluid conduits for conveying the pressurized fluid. The pressurized fluid source and a handpiece communicate with each other by the fluid conduits and a valving member is interposed in the liquid conduit for sucking the liquid during in a direction opposite to the liquid supply direction when the dental treatment operation is terminated. A check valve is interposed in the liquid conduit between the valving member and the dental treatment tool provided at the extreme end of the dental handpiece. | |
