Patents by Inventor Ilkka Renwall

Ilkka Renwall has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Preparing a crystalline, stable sodium percarbonate
    Patent number: 5603911
    Abstract: The object of the invention is a process for preparing a crystalline, stable sodium percarbonate, in which polymers of gross formulas (I or II) are added in the preparation process to control the crystal form of the sodium percarbonate and to coat the crystals, the molecular weight of the polymers varying in the range from 500 to 1,000,000 g/mol, or salts of these polymers or mixtures of polymers of formulas (I and It) or of their salts are added. Formula (I) denotes (I) and formula (II) denotes (II): HO--(--CH.sub.2 --CH.sub.2 --O).sub.r --(CHCH.sub.3 --CH.sub.2 --O).sub.s --(--CH.sub.2 --CH.sub.2 --O).sub.t --H and X<100% and Y>0%, R.sub.1 is --H or --CH.sub.3, R.sub.2 is --COOM, in which M may be H.sup.+ or a cation, in particular Na.sup.+, K.sup.+ or NH.sup.+.sub.4, R.sub.7 and R.sub.8 may be identical or different, being --COOM, --CONR.sub.5 R.sub.6, H, --OH or --COO(--CH.sub.2 --CH.sub.2 --O).sub.r --(CHCH.sub.3 --CH.sub.2 --O).sub.s --(--CH.sub.2 --CH.sub.2 --O).sub.t --H and R.sub.5 and R.sub.
    Type: Grant
    Filed: April 25, 1995
    Date of Patent: February 18, 1997
    Assignee: Kemira OY
    Inventors: Timo Korvela, Jonni Ahlgren, Bo Hedenas, Ilkka Renwall