Cup type casing packer cementing shoe
Patent 5318118 Issued on June 7, 1994. Estimated Expiration Date: 
March 9, 2012. 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.
March 9, 2012. 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 ReferencesInventorAssigneeApplicationNo. 848556 filed on 03/09/1992US Classes:166/202, Cup type166/318Operated by dropped elementExaminersPrimary: Britts, Ramon S.Assistant: Tsay, Frank Attorney, Agent or FirmInternational ClassE21B 033/126AbstractAn improved cup type packer cementing shoe comprising a single pump-out seat and all elastomeric sealing cups. | |
