Well cementing
Patent 4065318 Issued on December 27, 1977. Estimated Expiration Date: 
December 27, 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.
December 27, 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 2880102 3126291 3753748 3772045 InventorsAssigneeApplicationNo. 05/671159 filed on 03/29/1976US Classes:106/809, Organic sulfur106/803, Soil, diatomaceous earth, clay, slate or shale containing, or material for treating soil or earth (e.g., soil stabilization, etc.)166/293Cement or consolidating material contains inorganic water settable and organic ingredientsExaminersPrimary: Poer, J.Attorney, Agent or FirmAbstractWells and like borings into the earth's surface, especially those for the production of petroleum and gas, are very well and efficaciously cemented with cement compositions or pastes containing, as their effective gel control and cement set retardation agent, an additive that is a resulfonated, alkaline oxidized, hydrolyzed, partially desulfonated lignosulfonate product. | |
