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:
Feb. 13, 1996
Filed:
Aug. 17, 1994
Applicant:
Inventors:
Aldo Prevedello, San Donato Milanese, IT;
Goffredo Romano, San Donato Milanese, IT;
Assignees:
Eniricerche S.p.A., Milan, IT;
Snamprogetti S.p.A., Milan, IT;
Primary Examiner:
Int. Cl.
CPC ...
C09D / ;
U.S. Cl.
CPC ...
106668 ; 106725 ; 106807 ;
Abstract
Disclosed is a low-viscosity cement composition, useful in the field of oil drilling, comprising cement, water and an additive obtained by salifying into the alkali-metal, alkali-earth metal, or ammonium salt, the sulphonated and oxidated products derived from the reaction between sulphur trioxide and cookery tar or sulphur trioxide and fuel oil from steam cracking; the cement composition is endowed with improved rheological characteristics such as a low-viscosity value without substantial changes in the pumping times, even at high temperatures and pressures.