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:
Jun. 27, 1989
Filed:
Nov. 05, 1987
John R Grubbs, Jr, Mt. Pleasant, SC (US);
Aravamuthan P Sarathy, James Island, SC (US);
Robert C Flowe, Summerville, SC (US);
Westvaco Corporation, New York, NY (US);
Abstract
A method and apparatus for determining the phosphorus content which can be volatilized in a solid carbon sample. The sample is heated in the presence of steam to produce a vaporous steam containing volatile phosphorus. Next, the vaporous stream is passed through a zinc oxide layer whereby the voliatle phosphorus is retained. A colored solution is formed upon adding to the zinc oxide layer a vanadate-molybdate reagent. Finnally, the intensity of the colored solution is determined by a spectrophotometer; and the phosphorus content is determined by comparison with a standard intensity graph.