Septic tank system
Patent 3954612 Issued on May 4, 1976. Estimated Expiration Date: 
May 4, 1993. 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.
May 4, 1993. 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 933121 1029107 2674337 2802339 3332552 3483656 3892126 InventorApplicationNo. 483219 filed on 06/26/1974US Classes:210/86, Material level or thickness responsive116/228, Float166/54, Float controlled valve210/121, Float210/532.2, Septic tank210/91, Position or extent of motion210/93, In effluent conduit405/43, Porous or apertured pipe, flume, or tileway73/305FloatExaminersPrimary: Hart, Charles N.Assistant: Mukai, Robert G. Attorney, Agent or FirmAbstractA septic tank system is provided with an indicator above the ground surface to indicate the water level in the tributaries leading from the tank so that any excess water therein may be pumped out before it causes a back up of sewage upstream of the septic tank. | |
