Patents by Inventor Sheri Prosperi

Sheri Prosperi 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).

  • Process for de-inking recycled paper pulp with a reducing agent
    Patent number: 5429716
    Abstract: Recycled paper pulp is de-inked by pulping it at neutral or alkaline pH with an aqueous deinking composition comprising one or more reducing agents. The preferred reducing agents are sodium bisulfite and sodium borohydride. Sodium hydroxide is preferably used to give the desired pH.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: July 4, 1995
    Assignee: Morton International, Inc.
    Inventors: Maurice Hache, Sheri Prosperi