Filter structure
Patent 4696075 Issued on September 29, 1987. Estimated Expiration Date: 
January 21, 2006. 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.
January 21, 2006. 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 3339347 Floor maintenance machine and method Patent #: 4586208 InventorApplicationNo. 06/820168 filed on 01/21/1986US Classes:15/321, Manipulatable nozzle with flexible conduit connection to portable power and/or material supply unit, e.g., window washer15/353, With liquid and/or deflection type separator210/411Backwash or blowbackExaminersPrimary: Moore, Chris K.Attorney, Agent or FirmInternational ClassesA47L 11/30 (20060101)A47L 11/29 (20060101) AbstractIn connection with a surface material cleaning apparatus, a tank of cleaning fluid, an outlet line from the tank to a cleaning head, a suction pump carried by the tank recovering cleaning fluid from the cleaning head, a pump feeding the outlet line from the tank, a bleed line from the pump passing liquid into and through the filter under a relatively high pressure creating a motion of liquid through and about the wall of the filter maintaining the filter wall in a relatively unclogged condition, the cleaning fluid in the tank being recycled for cleaning purposes through the filter at a relatively low pressure. | |
