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:
Aug. 07, 1984
Filed:
Feb. 10, 1982
John M Yellowlees, Cheshire, GB;
Abstract
To enable the benefits to be obtained simultaneously of using cast iron as a major constituent and of using helical prestressing, the cylindrical wall structure of a pressure vessel (which may be for a nuclear reactor) is made of truncated wedge shaped cast-iron slabs (the wedge faces of the slabs lying in radial planes of the wall structure and mutually adjacent slabs abutting one another in those planes, with a plurality of such slabs forming an annular assembly and a plurality of such assemblies stacked coaxially to form the cylindrical wall structure), the slabs having cast-in through passages, disposed obiquely, both right and left-handed in alternate layers at progressively increasing radial distance with respect to the cylindrical wall structrue, and the passages of one slab in alignment with the ends of passages of adjacent slabs in the same annular assembly and in the annular assemblies stacked adjacent thereto to provide in the assembled cylindrical wall structure a system of right- and left-handed generally helical tendon ducts therefor.