The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1990
Filed:
Apr. 10, 1989
Kwok-Ping Wong, The Colony, TX (US);
Otis Engineering Corporation, Dallas, TX (US);
Abstract
Disclosed is a pipe union having a reliable metal ring seal and a resilient seal. The resilient seal is on the pin portion of the union, which has an internal seal surface. The box portion of the union has a bore to sealingly receive the resilient seal and an internal seal surface. The metal ring seal is compressed into sealing engagement with the pin portion and box portion sealing surfaces when the union pin portion and union box portion are connected together by a threaded collar. When the union is utilized in a tree cap for an underwater wellhead and the union box portion is attached to the wellhead, the resilient seal serves as a secondary seal and protects the metal seal. Well servicing risers or lubricators may be connected to the tree cap box portion.