Collapsible rubber dam
Patent 4498810 Issued on February 12, 1985. Estimated Expiration Date: 
February 12, 2002. 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.
February 12, 2002. 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 3173269 3786638 3834167 Collapsible rubber dam Collapsible rubber dam installation Patent #: 4330224 InventorsAssigneeApplicationNo. 06/238892 filed on 02/27/1981US Classes:405/115, Flexible405/91FlexibleExaminersPrimary: Corbin, David H.Attorney, Agent or FirmInternational ClassesE02B 7/20 (20060101)E02B 7/00 (20060101) Foreign Application Priority Data1980-03-06 JPAbstractA collapsible rubber dam secured to a riverbed portion and slope portions of both riverbanks is inflated and deflated by supply and discharge of a fluid. A pipe for supply and discharge of a fluid is communicated with the inside of the rubber dam from the shape portion of at least one riverbank except the riverbed portion securing the rubber dam. Preferably, the pipe for supply and discharge of the fluid is located in a region defined by a top end of the rubber dam located in the slope portion, a line connecting the top end of the rubber dam to substantially a middle position of a deflated width of the rubber dam at a toe of the slope portion, and a securing position of the rubber dam at the toe of the slope portion. | |
