Patents by Inventor Arthur H. Fischer

Arthur H. Fischer 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).

  • Preparation and use of xanthogen chloropropyl formate flotation reagents
    Patent number: 4313838
    Abstract: Flotation of copper sulfide ores in acid circuits has historically been promoted with ethyl xanthogen ethyl formate. Significantly improved results are achieved with the reaction product of ethyl or isopropyl zanthate with a chlorinated chloroformate. Sodium ethyl or isopropyl zanthate is prepared in an all-liquid system in the presence of excess alcohol. Chlorinated isopropyl chloroformate is prepared by reaction of phosgene and propylene epoxide in the presence of performed product as deluent and activated carbon as catalyst. The chloroformate and xanthate-alcohol mixture are reacted, and the alcohol may be recovered from the aqueous phase.
    Type: Grant
    Filed: April 19, 1979
    Date of Patent: February 2, 1982
    Inventors: Arthur H. Fischer, Lawrence E. Strow, Franklin A. Bolth
  • Flotation process with use of xanthogen chloropropyl formate reagents
    Patent number: 4191641
    Abstract: Process for flotation of copper sulfide ones using a flotation reagent produced by the reaction of an alkali metal lower alkyl xanthate and 2-chloroisopropyl formate.
    Type: Grant
    Filed: January 26, 1978
    Date of Patent: March 4, 1980
    Assignee: Mineric Corporation
    Inventors: Arthur H. Fischer, Lawrence E. Strow, Franklin A. Bolth
  • Flotation reagent and process
    Patent number: 4136020
    Abstract: The performance of xanthogen formates as reagents for the flotation of sulfide copper ores is significantly improved by reacting the xanthogen formate with an aromatic amine. In a preferred embodiment, up to about 20% of an aromatic diamine, most particularly o-phenylene diamine and o-toluene diamine, is used.
    Type: Grant
    Filed: November 11, 1976
    Date of Patent: January 23, 1979
    Assignee: Minerec Corporation
    Inventor: Arthur H. Fischer